Religion Bads

If God sees everything, and someone believes that doing wrong is sinning, and sinning is obviously wrong, then why do people do bad things? Is it because they are ignorant to the fact that they are doing the wrong, or do they really not believe God sees everything?

If Hell didn't exist, how many people would go to church? My grandma always said "Go to church to avoid going to Hell", but I rarely heard "We're going to church to get to Heaven". So if you think about it, would people still go to church if hell wasnt the punishing incentive?