Belief in heaven makes people reckless. (faith.org.uk)
If we are inclined to think that, without an afterlife, Christians would do better, than we should conclude that the (potential) promise of heaven makes people behave poorly or attract people who behave poorly. (nakedpastor.com)
At the crassest level, the level the theological expert at the next table should understand, belief in heaven makes saints as well as suicide bombers. (faith.org.uk)