Intellectual show offs.

It'd be stupid if I reject Mormon's Scripture without even reading and understanding it just because they're not Muslim.

Not true.

You see, we don't believe that others' hearts are diseased because we have no knowledge of others' hearts.

We believe that faithlessness and doubtfulness is a disease of heart (like jealousy, pride and other diseases of the heart) and how we should protect ourselves from this disease.

Atheists don't believe that faithlessness is a spiritual disorder, they don't even acknowledge "faithlessness" as a thing so how can they be so offended?