We attach too much power to our belief. This can be counter productive. One who believes his religion is the best in morals would be dissapointed to find out they the religious leaders is involved in immoral activities. He may be dissapointed and vow to change church.
Another who strongly tithe regularly may feel betrayed for being sacked. It is like the God did not fulfill his own part of the bargain. This may lead to a rejection of all Religion
Someone who love violence would look for the biblical verse justifying violence perpetuate his act.
When we nurture a belief into truth, it becomes serious. We cannot no longer joke out of them.