The good done in the name of religion outweighs the harm done for the same reason.
It is impossible to prove this argument objectively. One religion's measure of "good" and "bad" can be entirely independent of another's.
Any religious organization should be banned
The amount of conflict that would be created by banning religion would far exceed anything in the world now. Most conflict centered around religion is because people feel their faith is threatened, imagine how this would be compounded if every religious person in the world felt this pressure.