Say it.. :)

David   : Morning.. what a great day..
Muslim : Morning.. so, hows ur Christmas?
David   : Great.. will be enjoying very soon..
Muslim : Good..
David   : No wish for me??
Muslim : Islam respects the non muslim, but to greet other religion is not allowed.
David   : But why?
Muslim : Seems like we can't stop u to drink liquor, but we can't drink it..
David   : But many Muslim did wish for me..
Muslim : Can you confess our confession of faith? (syahadah)?
David   : No!!.. Cannot!! it will effect my faith..
Muslim : But why? just a word.. :) say it..
David   : Now I am understand.. :)