As a self-described religious person, I'd like to throw in my 2 cents.
It's a lot easier to misuse a gun than say, a garbage can or a can opener. It's easier to misuse a sharp kitchen knife than it is to misuse a spoon.
Misusing religion may be the responsibility of the person(s) who is/are misusing it, but religion has a tendency towards equipping/encouraging its adherents to misuse it. It promotes a "there's a certain truth and I know it" attitude that leads to intolerance and prejudice and leads a person to justify all his/her more negative desires, such as vengeance and dominance.
I do not think this means there is no truth or that truth cannot be known or that all religion is bad. There are temptations inherent in owning a gun. The owner must not only avoid murder, he must avoid carelessness. It is not only the driver who purposely runs down a pedestrian who is guilty, but a drunk driver who accidentally runs down a pedestrian is just as guilty (or at least almost), because of carelessness.
The person who takes up religion had better know what he's getting into, because while it may encourage some morality, it is a powerful temptation to immorality, hypocrisy, and cruelty as well.