The Supreme Being and Creator of the Universe.
In ancient Tagalog theology, Bathala (or Batala) was the supreme being and the omnipotent creator of the universe. Antonio de Morga, among others, thought that Bathala meant an omen bird (Tigmamanukan), but the author of the Boxer Codex (1590 b, 379) was advised not to use it in this sense because they did not consider it God but only his messenger. It was after the arrival of the Spanish missionaries on the Philippines in the 16th century that Bathala came to be identified as the Christian God, thus its synonymy with Diyos (God) or Dibino (Divine, e.g. Mabathalang Awa), according to J.V. Panganiban (Diksyunaryo-Tesauro Pilipino-Ingles); in some Visayan languages Bathala also means God.
The spelling of the name "Bathala" given by Pedro Chirino in "Relaciön de las Islas Filipinas" (1595-1602) was perhaps a combination of two different spellings of the name from older documents such as "Badhala" in "Relacion de las Costumbres de Los Tagalos" (1589, Juan de Plasencia) and "Batala" in "Relacion de lasYslas Filipinas" (1582, Miguel de Loarca), the latter was supposedly the correct spelling in Tagalog since the letter "h" was silent in Spanish. Bathala or Batala was apparently derived from Sanskrit "bhattara" (noble lord) which appeared as the sixteenth-century title "batara" in the southern Philippines and Borneo. In Indonesian language "batara" means "god", its feminine counterpart was "batari". It may be worth noting that in Malay "betara" means holy, and was applied to the greater Hindu gods in Java, and was also assumed by the ruler of Majapahit.
Since the name Bathala was Sanskrit in origin, some scholars such as Isabelo delos Reyes believed that Maykapál ("Creator") was the indigenous term for the Supreme Being of the Tagalogs. Dr. José Rizal doubted that the Tagalog god was named Bathala. Most historians and scholars however accepted that the god was properly called Bathalang Maykapál ("God the Creator") as stated in Relación de las Islas Filipinas (1595-1602), and could be addressed simply as Bathala (God) or Maykapál (Creator). According to William Henry Scott (Barangay: Sixteenth-Century Philippines Culture and Society); "Loarca and Chirino said that the Tagalogs recognised a creator god they called Bathala (Batala) though other informants named the god of the Tagalogs as "Molayri" (Molaiari) or "Diwata" (Dioata)". Some scholars believed Molayri was actually May-ari ("owner"), however it could also be May-yari which means "One that made". As for the name Diwata it should be noted that it was also a name of the Supreme Being in other Filipino ethnic tribes, it was also a term for deity in other Philippine languages such as Visayan. Linguists trace the origin of the term diwata to Hindu term Devata (Devanagari: देवता), which also refers to deities. The word Bathala is came from Javanese Sri Batara Guru which also known as "Shiva" in Hinduism.
An excerpt from the Boxer Codex (1590b, 367) about Bathala according to the "heathen" Tagalogs:
"They said that this god of theirs was in the air before there was heaven or earth or anything else, that he was ab eterno (from eternity) and not made or created by anybody from anything, and that he alone made and created all that we have mentioned simply by his own volition because he wanted to make something so beautiful as the heaven and earth, and that he made and created one man and one woman out of the earth, from whom have come and descended all the men and their generations that are in the world."
Anitería was the term coined by Spanish missionaries to denote the Tagalog religion as they observed that despite the people's belief and respect to the omnipotent Bathala, they offered prayers and sacrifices to ancestral spirits called anito. Miguel de Loarca (Relación de las Yslas Filipinas, 1582) asked them why the sacrifices were offered to the anitos, and not to Batala, they answered that Batala was a great lord, and no one could speak to him directly because he lives in heaven (Kaluwálhatian), so he sent down the anitos to provide for them. Thus, the soul (káluluwa) of a person becomes an anito (ghost or ethereal being) after death to serve Bathala and intercede on behalf of the living, similar to concepts in Folk Catholicism or Spiritualism.
After the conversion of the Tagalogs to Catholicism, the katalonan (shamans) were condemned by Spanish missionaries as witches and were forced to convert. Ancestral and nature spirits were demonised, sometimes conflated with Biblical demons, and the term anito itself became synonymous to "idol". The Spaniards believed that the anitos were demons who deceived the Tagalogs from the worship of God, but Bathala was the exception to this as he was similar to the Christian concept of the Creator. According to Sir John Bowring (A Visit to the Philippine Island) "the priests have been generally willing to recognize the name Bathala as not objectionable in substitution for Dios (God)".
Bathala in other cultures and ethnic groups
In ancient Bicol, Bathala was worshipped as a minor deity, represented by a small image which they always carried for good luck; according to Lisboa (1628, 61) "they say it was an anito that brought good luck to one it accompanied". Thus if a man was never hit by objects thrown at him, he was said to be batalaan.
Some scholars also identified Bathala with the Zambal deity Mallari (Mayari), though according to San Nicolas (1664, 420), Bathala Mey kapal (Maykapal) was also listed among their deities, whose false genealogies and fabulous deeds they celebrated in certain tunes and verses like hymns, which William Henry Scott wrote may due to the influences of the Tagalogs in their culture or beliefs.
An ancient Visayan invocation goes:
1. Bathala, origin of the first creatures,
Lives in the high mountains;
In your two hands
Resides the generator-
Maniliw, who is a witch.
Tall like the trunk
Of the coconut;
Solid like rock;
Voracious like fire;
Fierce, more than the mad perverse dog.
From your breast
The generator Lulid
It is he
Who does what he likes;
More than the night-
Like the stalk of the Palay;
As if by means of rays of light,
Shoots the witches like an arrow.
Your living among the pygmies.
Destroy, oh, those bad characters
Of the generator Kamakala.
2. Bathala, thou art, oh, little bird, Adarna!
Oh thou, who art nestled in that encumbered home-
The abode of hawks and eagles,
Descend, we pray thee, to earth,
With all thy multicolored feathers
And thy silken, feathery tail-
Descend! Descend!-to earth.
Oh, thou bright-winged, little bird!
Celestial gift arth thou, prepared for the earth-
Our life's source, our mother devoted.
Verily, thou hast suffered pains in those confines
Of mountains craggy and precipitous-
Searching for lakes of emerald, now vanished.
Art thine, mother
Oh, venerable Mount Kanlaon-
The ruler of the people of the mountain. 
Bathala, pinunuan sang mga
una nga mga inanak,
Dito mag estar sa mga layog
Sa anang alima na tagsa
Si amay Maniliw nga tamaw
Malayog anay sang puno ka
Mabakod angay sa bantiling,
Kag masupong angay sa
Mabangis labi a madal nga
Bany-aga nga ayam.
Sa amang kilid lumsit.
Si ama Lulid Amo;
Siya ang mag sumunod
Kon tunay sa boot niya,
Nga mag bulit labing
- Tagalog Translation
Bathalang pinagmulan ng
mga unang nilikha,
Nakatira ka sa mga bundok
Sa kamay mo nakalagay
Si Maniliw, na mangkukulam
Matayog kang parang puno
Matigas na parang bato,
Masiklab na parang apoy,
Mabangis na higit sa
Sa dibdib mo lumabas
Ang manlilikhang Lulid Amo;
Siya ang nakagagawa
At nagbibigay dilim
Na higit sa gabi…
It is identified that the Philippine Bathala is related to the Indonesian Batak chief god named "Batara Guru," son of the blue hen goddess "Manuk Patiaraja" (Manuk means hen and it is "Manok" in Tagalog). In Indonesian Javanese mythology, Shiva known as Bathara Guru.
- Teofilo del Castillo Y Tuazon; Buenaventura S. Medina Jr.; Pacita C. Inocencio-Nievera. Philippine Literature: From Ancient Times to the Present.
- Jose Villa Panganiban; Consuelo T. Panganiban; Genovera E. Manalute; Corazon E. Kabigting. Panitikan ng Pilipinas; Binagong Edisyon.
- Vocabulario de la Lengua Tagala by Juan de Noceda and Pedro de Sanlucar.
- Diccionario Mitologico de las Filipinas by Ferdinand Blumentritt.
- Boxer Codex (1590)
- Relacion delas Islas Filipinas (1595-16020) by Pedro Chirino.
- Relacion de las Yslas Filipinas (1582) by Miguel de Loarca.
- Relacion de las Costumbres de Los Tagalos (1589) by Fray Juan de Plasencia.
- Barangay: Sixteenth-Century Philippines Culture and Society by William Henry Scott
- A Visit to the Philippine Island by Sir John Bowring.
- Philippine Literature: From Ancient Times to the Present by Teofilo del Castillo Y Tuazon and Buenaventura S. Medina Jr.
- Panitikan ng Pilipinas; Binagong Edisyon by Jose Villa Panganiban, Consuelo T. Panganiban, Genovera E. Manalute, Corazon E. Kabigting
- Diksyunaryo-Tesauro Pilipino-Ingles by J.V. Panganiban
- Tanya Storch, ed. (2006). Religions and Missionaries Around the Pacific, 1500-1900. Pacific World 17. Ashgate Publishing. pp. 33–36. ISBN 0754606678.
- Dianne de Las Casas; Zarah C. Gagatiga (2011). Tales from the 7,000 Isles: Filipino Folk Stories. ABC-CLIO. pp. 80–81, 149–150. ISBN 1598846981.
- Dean Spruill Fansler, ed. (1921). Filipino popular tales. Memoirs of the American Folk-lore Society, Filipino popular tales 12. The American Folk-lore Society. pp. 219, 399–424.