Question: Pey Azhwar is one of twelve azhwar saints of what Indian religion?

Context paragraphs:
Aranmula Parthasarathy Temple: The Aranmula Parthasarathy Temple is one of the "Divya Desams", the 108 temples of Vishnu revered by the 12 poet saints, or Alwars located near Aranmula, a village in Pathanamthitta District, Kerala, South India.  Constructed in the Kerala style of architecture, the temple is glorified in the "Divya Prabandha", the early medieval Tamil canon of the Azhwar saints from the 6th–9th centuries AD.  It is one of the 108 "Divyadesam" dedicated to Krishna, an avatar of Vishnu, who is worshipped as Parthasarathy (Partha's charioteer).  The nearest railway station to the temple is located in Chengannur, while the nearest airport is Trivandrum International Airport.

Adikesava Perumal temple, Mylapore: Adi Kesava Temple is dedicated to Hindu god Vishnu located in Mylapore, Chennai, in the South Indian state of Tamil Nadu.  Constructed in the Dravidian style of architecture, dedicated to Vishnu, who is worshipped as Sri Aadi Kesava Perumal and his consort Lakshmi as Mayuravalli Thayar.  The temple is believed to be the birthplace of Peyazhwar, one of the first three of the twelve azhwar saints of the 6th-9th century AD.

Nachiyar Koil: Nachiar Kovil or Thirunarayur Nambi Temple in Thirunarayur, a village in the outskirts of Kumbakonam in the South Indian state of Tamil Nadu, is dedicated to the Hindu god Vishnu and his wife Lakshmi.  Constructed in the Dravidian style of architecture, the temple is glorified in the "Divya Prabandha", the early medieval Tamil canon of the Azhwar saints from the 6th to 9th centuries AD.  It is one of the 108 "divyadesams" dedicated to Vishnu, who is worshipped as Srinivasa Perumal and his consort Lakshmi as Nachiyar.  The temple is the place where god Vishnu is believed to have initiated "Pancha Samskara" (religious initiation) to Thirumangai Azhwar.  The temple follows the Thenkalai mode of worship.

Poigai Azhwar: Poigai Azhwar (also spelt Poygai Alvar or Poigai Alvar or Poygai Azhwar) is one of the twelve "azhwar" saints of South India, who are known for their affiliation to Vaishnava tradition of Hinduism.  The verses of "azhwars" are compiled as "Nalayira Divya Prabandham" and the 108 temples revered are classified as "Divya desam".  Poigai is one of the three principal "azhwars", with the other two being Bhoothathazhwar and Peyazhwar, collectively called "Muthalamazhwargal" who are known to be born out of divinity.  Poigai composed hundred verses that are classified as "Muthal Tiruvandadhi" and his composition is set in the "Andhadhi" style in which the ending syllable is the starting one for the next verse.

Vedarajan temple, Thirunagari: Vedarajan Temple in Thirunagari, a village in Nagapattinam district in the South Indian state of Tamil Nadu, is dedicated to the Hindu god Vishnu.  Constructed in the Dravidian style of architecture, the temple is glorified in the "Divya Prabandha", the early medieval Tamil canon of the Azhwar saints from the 6th–9th centuries AD.  It is one of the 108 "Divyadesam" dedicated to Vishnu, who is worshipped as Vedarajan and his consort Lakshmi as Amruthavalli.  The temple is believed to be the birthplace of Thirumangai Azhwar, one of the twelve Azhwar saints.

Madhava Perumal temple: Madhava Perumal Temple is dedicated to Hindu god Vishnu located in Mylapore, Chennai, in the South Indian state of Tamil Nadu.  Constructed in the Dravidian style of architecture, dedicated to Vishnu, who is worshipped as Madhava Perumal and his consort Lakshmi as Amirtagadavalli.  The temple is believed to be the birthplace of Peyazhwar, one of the first three of the twelve azhwar saints of the 6th-9th century AD.

Jagannatha Perumal temple: Jagannatha Perumal Temple (also called Tirumazhisai Temple is dedicated to Hindu god Vishnu located in Tirumazhisai, Tiruvallur district, in the South Indian state of Tamil Nadu.  Constructed in the Dravidian style of architecture, dedicated to Vishnu, who is worshipped as Jagannatha Perumal and his consort Lakshmi as Thirumangaivalli.  The temple is believed to be the birthplace of Thirumalisai Alvar, one of the twelve Azhwars whose work is compiled as "Divya Prabandha", the early medieval Tamil canon of the Azhwar saints from the 6th–9th centuries AD.

Pey Azhwar: Pey Azhwar (also spelt Peialvar or Peyalvar or Pei Azhwar) is one of the twelve "azhwar" saints of South India, who are known for their affiliation to Vaishnava tradition of Hinduism.  The verses of "azhwars" are compiled as "Nalayira Divya Prabandham" and the 108 temples revered are classified as "Divya desam".  Pey Azhwar is considered third in the list of the three principal "azhwars", with the other two being Poigai Azhwar and Bhoothathazhwar, collectively called "Muthalamazhwargal" who are known to be born out of divinity.  Pey Azhwar composed hundred verses that are classified as "Moondram Tiruvandadhi" and his composition is set in the "Andhadhi" style in which the ending syllable is the starting one for the next verse.

Bhoothath Azhwar: Bhoothath Azhwar (also spelt Bhoothathalvar or Bhoothath Alvar) is one of the twelve "azhwar" saints of South India, who are known for their affiliation to Vaishnava tradition of Hinduism.  The verses of "azhwars" are compiled as "Nalayira Divya Prabandham" and the 108 temples revered are classified as "Divya desam".  Bhoothath is considered second in the list of the three principal "azhwars", with the other two being Poigai Azhwar and Pey Azhwar, collectively called "Muthalamazhwargal" who are known to be born out of divinity.  Bhoothath composed hundred verses that are classified as "Irandam Tiruvandadhi" and his composition is set in the "Andhadhi" style in which the ending syllable is the starting one for the next verse.

Hinduism: Hinduism is an Indian religion, or a way of life, widely practiced in South Asia.  Hinduism has been called the oldest religion in the world, and some practitioners and scholars refer to it as "Sanātana Dharma", "the eternal tradition," or the "eternal way," beyond human history.  Scholars regard Hinduism as a fusion or synthesis of various Indian cultures and traditions, with diverse roots and no founder.  This "Hindu synthesis" started to develop between 500 BCE and 300 CE following the Vedic period (1500 BCE to 500 BCE).

Supporting paragraphs: Pey Azhwar Hinduism
Answer: Hinduism