There are over 500 religion worldwide,
1)Each believer follow and worship their respective God/god of their religion. Each God/god have different identity, characteristics and way of operating like when comparing God of Christian with God of Muslim with God of Buddhist, you'll realize those Gods are very distinct. Even Abrahamic religions claim to have a seperate God
2) Each religion have book of reference (scripture) which is quite different and contradicting eachother - like when comparing Bible, Quran, Tripitaka, Nigveda...
3) Each religion have different doctrine and way of doing ritual.

- Christian claim Christianity is right path
- Muslim claim the right path is Islam .... likewise other Religions
- But there can never exist more than one God thus, more than one Religion cannot be true. here is the reason

1st premise: two or more Religion can never be true/justified because their ways are contradicting. "This is rational"

else, if two or more Religion are true, that simply means true Christians will emerge in heaven as promised in the Bible and same time emerge in HELL of all other Religions as promised in their respective scripture. it's not even correlating with any scripture "Thus it is irrational"

2nd premise: there can never be more than one God who is responsible for creation of all things, else the irrational part of 1st premise will be satisfied

3rd premise: Each true believer have conviction, revelation and other experiences that make them strongly believe, strictly follow, devoted, and worship God/god in respect to their religion

conclusion: Two or more Religion can never be true else all Religion are delusion.

Question 1: Is Religion illusion or not?
Question 2: which Religion is actually true?
Question 3: why is the truth not universal (why is it subjective)?
Question 4: is the Divine experience of followers of other false Religions self-fulfilling prophecy.
all answers with proof pls