I'll preface this by saying yes: I personally believe in the Christian God as I am myself a practicing Roman Catholic.
However, while there is definitely some intersectionality between faith and reason a lot of it is, well, faith. I would be lying if I said I never questioned my religion or had my own skepticisms. A major component of organized religion is taking things on faith, which is something I definitely have trouble with doing at times.
But the same time I don't think it's irrational to infer the existence of some arbitrary higher power using reason alone. As I understand it, the only way a purely atheistic universe could exist is through an infinite regression of events. Either the universe continuously recycles itself or some form of the multi-verse theory is true. However the idea of infinite regression is both logically fallacious in nature and scientifically dubious in practice, neither of the above models for the universe reflect our current scientific understanding.
Our current understand yields that the universe is finite in time; having both a well established beginning in the big bang and a probable end in heat death. Furthermore, as I understand it, all infinite regression theories for the universe lack any credible evidence. In other words, there is no proof or even logical ground for them to stand on, making them nearly as faith based as any organized religion. Therefore given our current understand there has to be some unmoved mover or some uncaused causer; whether it's the Abrahamic God, some pantheon of gods, or maybe just a really big unconscious rock. The idea here is that the only way to avoid a Homunculus Fallacy is to have some entity that exists unbound by the physical laws of our universe, and that being would be defined as God for lack of a better definition. Asking "what caused God" is also a fundamental misunderstanding of the argument being made, because under these metrics God has to be defined as the uncaused entity (i.e an infinite being).
I'll note however that the above statements aren't an argument for the existence of God in the conventional sense. The argument can't be used to prove or even infer the existence of an intelligent designer, it merely acknowledges the probable existence of some higher power outside of our physical laws; and I think that's about as far as one can get through reason alone.







