mayomick said:
"Perhaps that is what religious people find offensive - atheists effectively calling them liars ?"

But, surely, Christians are effectively calling Muslims liars because Christianity does not recognise Mohammed as a prophet of God!

Of course, Christians would think twice about stating those beliefs in public!

The truth is that Judaism, Islam and Christianity are - effectively - an insult to each other!

But - most of the time - they tip-toe around that fact!