"The church endowed all human beings with a soul, and it took a man's life only to save his soul."
The Church never executed anybody, it left that to the civil authorities.
The Church would hold trials to determine if someone is a heretic, such as the Inquisition, but the state did not have to consequently punish heretics if it didn't want to. The fact is that heresy is a danger to the STATE, not just the Church, leading to immorality and vice and disorder.
True, it may seem to pagans like a distinction without a difference. But nevertheless it's a distinction. As for the Crusades, that is not "taking a man's life" in the sense of burning a heretic at the stake, but war. Again it's not the "Church" that goes to war, Catholic soldiers yes, even encouraged by the Pope, but the Church itself isn't killing anyone. A call to arms by the Pope doesn't fall under infallibility, it isn't the same as the CHURCH giving a call to arms, which doesn't mean it should be disregarded necessarily.
The Church, according to my understanding -- which may be faulty -- never technically is involved with any kind of killing. Neither executions nor wars can be imputed to the Church, although members of the Church, even the highest members, may be involved to a greater or lesser extent. Not that that means all corporal punishment is bad as some hippies would have us believe. The Church combats heresy on a spiritual and intellectual plane; members of the Church may sometimes get involved in bƖσσdshɛd if such is deemed necessary.