If religion didn’t exist all of the universe wouldn’t exist, the fact that religion and our nature to believe in god is a result of this world and universe being created, god created all of this and us, testing us through out of it, and us believing in god and religion is also a key factor, so no religions would mean that this whole universe never existed in the first place

As long as humans exist there will be war. WW1 and WW2 were the biggest wars in history. The destruction those wars brought is probably worse than all the religious wars combined since time began. I'm not an expert on all religions but I know for a fact Islam advanced civilisations plentiful with alchemy, algebra, cryptography, chemistry, astrology, geography, etc. And without the belief in a higher power people wouldn't care about destroying the earth and we can see that happening now.