God, as understood in many religions, is considered eternal and uncreated. Therefore, God did not have a birth and consequently, has no birthday. The concept of birth implies a beginning, a point of origin. However, the nature of God in most theistic belief systems transcends the limitations of time and space. He is considered to have always existed.
Different Perspectives on God's Existence
Several sources explicitly state that God was not born:
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Christian Theology: Christianity maintains that God is self-existent and eternal. He wasn't created or born; he always existed. [Source: "A birthdat implies a birth. Since Christianity maintains that God wasn't created, he always existed, he was never born so he has no birthday. 02-Oct-2019"]
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Other Religious Views: Similar concepts of an uncreated, eternal God exist in other religions, although the specifics may vary. The idea of a god having a birth is generally not found in mainstream theological interpretations. [Sources: Multiple Quora responses and various religious texts]
The only exception to this understanding relates to the concept of incarnation within certain religions (like Christianity, where God took on human form in Jesus). This event is not a birth of God, but rather a manifestation of God within human form. [Source: "The only instance of God being born is when God took on humanity during what is known as the Incarnation or when Jesus became a man. Otherwise,…" ]
The question of God's origin is often debated philosophically and theologically, but the idea of God having a birth date is not supported by major religious traditions.