I am kind of weird because I was raised catholic, and my parents are both catholic, but they are also Democrats and my Dad in particular is one of the more logical/analytical people I know.
I look at him and try to understand how such a smart, logical thinking person can believe in God, and it makes me wonder what he has experienced in his life which is so convincing that it makes him a believer.
We are a product of our past experiences, along with the ability to adjust based on our own current observations. So if many of our own experiences that shaped our world view espouse the existence of God, and you don't currently observe anything that contradicts those experiences, you are more likely to also believe in the existence of God.
I consider myself a man of science - and before all the scoffing starts, I mostly mean computer science. I consider myself pretty good at analyzing and logically reaching conclusions based on observations.
I think, and you can correct me am if I am wrong, that you want to know just as much why one would believe in God or not, as much as you want to know what would make one change their belief. It is sort of asking the same thing.
If the things that make me believe in God are proved to my satisfaction to be wrong, it would not be logical for me to continue to believe in God.
I will confess that the deeper one studies, and the more one reads how others come to believe, the more likely there will be questions that you just can't answer. That is how I view the search for truth. You would really like to find answers to strengthen your world view, but you may also find that you are just as likely to need to adapt your belief, because the answers you find are not what you expected.
I wouldn't go into all that unless I was going to provide my basic reasons for a belief in God.
1) We have free will. Without that free will, there would be almost no point in believing in God. Also believing in it can explain why God would let bad things happen to good people. A study of the philosophical differences between some very intelligent people that side with determinism rather than free will is a very enlightening experience.
2) The "I think therefore I am" beliefs of Descartes, which leads one to believe in a soul, and differences between body and soul. If I do have a soul, then answering some difficult question about why I have a soul definitely can lead to the existence of God, at least for me.
3) I do not really want to live in a world that does not have the existence of God. I mean what kind of desolate place would that be? I look at the world we do live in, and in all the wonderment of a child learning great things, I can see the existence of God being a pretty formidable reason for it.
4) I believe Jesus rose from the dead, which signifies to many believers God's power over life and death. If this one act did not really occur, it would go a long way towards making me question a lot more than I do. There is no proof either way, and I have read more about this subject than just about any other. My conclusion, so far, is that you still have to have faith, or why else believe in God at all? Which I assume is part of a non-believers mantra.
5) Lastly, I like believing in God. Everyone talks about this mythical being you are supposed to worship, sight unseen. Nowhere that I know of does God require that you worship him. There are millions of man-made rules that heap all kinds of unattractive, and usually self-serving control over you. Well that isn't God. That is man interpreting, incorrectly I might add, what God should mean to me, and what rules I should follow because of it. Society works due to some of these "laws", but I easily separate that from my world view of the existence of God.
So that is why I believe, pretty ardently I might add, that God does exist.
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