Sometimes you, as a parent(please notice that I'm not one), one uses religion to explain certain things that exceed the natural or are hard to teach at their age(e.g. Grandmum made the bag and went to Heaven). It also works to delimitate whats good and what is not, and to prepare them to be teached about religion. Its not a mental abuse, its just teaching them what is good and bad for God (the Christhian one and the other Gods also). If you send them into a catholic school, they are teaching them a lot more of God, but in any point they are commiting mental abuse. Later, if that child doesn't believe in God, is his or her choice, and if in one moment of their lifes they believe in God, good. If they don't believe in God for the rest of their lifes, good also.

Maybe you should define what mental abuse is, if you are still in the forum.