What made you stop believing in God? Why was this significant to you? Please be sincere in your answer.?

hearing all the view points all the different religions then all the religions within religions and hearing people explain that hundreds of years ago people believed that gods ruled the world and laughing and hearing that hundreds of years ago people thought the earth was flat. and that we were the only planet and that... and after awhile i stopped laughing and looked around and saw all these people shouting what to believe and when asked why they would say because i'm right if I wasn't right that would be ridicuous. as well as all the holes in every view of religion.