You say that, but you're alive. So I'm assuming that you do somewhat appreciate being alive since you haven't unalived yourself. You might even think it's pretty neat.
That God is the reason for my/your/our/Our existence, seems clear enough, you can refer to Aristotle or pretty much any other theologian on this topic.
See, believing in God was never irrational after all, you were just brainwashed by modernity(, on this topic as well).
Also, God is the Greatest being, by definition(, see St.Anselm ٱللَّٰهُ أَكْبَرُ), so S..He is also my/(y)our/Our/the Guide/Example/Light(house)/..
They didn't say everything is superfluous, they said God is. You're conflating "God" with "everything", but understand that is far from a universal understanding of how the universe works. If you're not sure how the other person feels about this you need to ask instead of assuming they share the same definitions you do.
Your two neurons seem to not grasp the idea that if a god exists, something must've made it so, which means we're back to the same problem as if no god existing. If such a god exists, they're no more important than random quantum fluctuations, and infinitely more sadistic.