I know enough to know that I despise it. I've read enough of the so-called 'holy books' to know that. No matter what these theologians say/have said about their faith, that does not change the fact that the 'holy books' which the Abrahamic religions are founded on are hate-filled books about, among other things, justifying genocide, murder, rape, racism, perverse ideas, and moral rules/laws which are not only flat out ridiculous, but also disgustingly evil and horrible. You cannot get away from that fact, and that fact explains my 'immature' and hostile attitude towards it.
Theism falls short, both scientifically and philosophically, and, perhaps most importantly, morally.