Everyone has something they have doubts about. It’s human nature I believe. As a person of faith, I have them all the time and that doesn’t make me less of a believer.
My God is big enough to understand. There is a story of a man named Thomas in the Christian tradition who had doubts about the return of Jesus after his crucifixion. It’s those doubts that made Thomas’ faith stronger. Doubt does not mean one stops believing it can mean getting more information in hopes you can be a better person.
It’s OK to have doubts based upon experiences in life. It’s easy to doubt when you have been let down about something. Doubts can help us make wise decisions about things. My friend’s doubt is a good thing. It’s a tool that can help you be a better person.