when muslims say kalime they say : there is no god other than allah and muhamed is the prophet. this insults all the other people who hv faith in various other gods. so,if a non muslim says that : i dont believe in allah and muhamed is no prophet,this is a reciprocation of the islamic kalima. but will this guy be alive for long ??? is islam a religion of peace or killer religion of pieces ??? first let muslims stop hurting other people's sentiments then we talk talk with muslims who hurt their sentiments.