If you want to understand God-ness then you need to study San Tomas Aquinas. A little Aristotle would not hurt you either. Aristotle came up with "prime mover" on his own. Aquinas came up with "first cause", "artistic artificer", etc. on his own. If you want to understand Christianity then you should memorize Matthew Chapter 25. As far as Judaism is concerned, I don't recommend anybody going there. It is 34 centuries old and has been modified over and over during those 34 centuries. The Jews cling to their religion for cultural reasons. It's good for that. Not much good for anything else. They are no longer a desert vagabond tribe wandering from place to place. That all changed for good in 1948. So they are overdue for a whole new reformation. Reformed Judaism is probably their future.