Since many religions have the one true god which one is real?

Answer 1

when all believers are dead, the god that remains.

(Another reply) All of them, or many of them. The fact that people call God by different names doesn't necessarily mean that those are different gods. For example, Christians believe in a god which they call "God", but that is if they speak English. The same Christian denomination will call Him "Dios", if their language is Spanish. So, my opinion (which reflects my belief as a Bahá'í) is that different religions pray to the same God - and that, in fact, those religions began as revelations from the same God.

Answer 2

It could be reasoned that, since God created ALL of humanity, would God favor only one people with a "true" religion and abandon all others? Would God leave any of His creation without teachings and laws to advance mankind? Timelines of the genesis of each major world classical religion indicate that they all began in the East but, until fairly modern travel (when they became truly global), each spread only in specific areas - e.g., Hinduism (c.3200 BCE)/Asia; Judaism (c.1300 BCE)/Near East & Europe; Buddhism (563 BCE)/Far East; Christianity (33 CE)/Europe; Islam (621 CE)/Middle East. Even the world's indigenous tribes have oral spiritual teachings that predate the written Word.

It could be reasoned that, at any given time in man's history, each of the major classical world religions was the latest"true" revelation from God at the time it was revealed to a segment of mankind having a specific need for it. Sects of the major classical religions, which number in the thousands, are nevertheless offshoots under the umbrella of the others and should not be considered as distinct religions in their own right. The latest known truly independent world religion having come out of the East is the Baha'i Faith (1863 CE).