No disrespect intended to agnostics, but if I was agnostic about say a huge bomb been created just by smashing the smallest element, the atom, at least I would have to boast I read some books on physics, or whatever, as an adult before I could be dismissive of all physicists say?
I mean to say I have a friend agnostic, and when I asked him would he like to read a book on the Proofs of Gods existence, he said no, he doesn't read such books because he is agnostic!
Anyways Catholics believe, following the great Greek philosophers in this, that the existence of God can be proven, that it is not a matter of faith. Other elements in Catholicism are matters of faith, but not the existence of God Himself. Anyway here is a book on all this if you are interested:
http://www.orwellianireland.com/proofs.pdf