I was brought up as a Catholic but I do not believe in God. If there is an almighty powerful God why would they allow innocent people to suffer and sinners to prosper, why would there be so much misery and suffering in this World? Why would they allow people to have so much and others to have nothing. Why would they allow people to be persecuted?
There may be many arguments to why they allow this to happen but even if God does exist they are not someone that I would look up to.
I think an explanation that many Christians use is choice. Do you think it would be right for a God to restrict your choices. If you were about to do something "bad", He could just stop you. Do you think that's a better option? Then maybe people would be angry at this God for not giving people freedom. The Bibles talks a lot about mortal life being a testing period. People need to do good on earth, so they can have great rewards after. If God didn't let anybody do bad, then there would be no way to measure. Everybody would only do good.