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)/…