Islam is NOT a religion of peace
Like he said, try to rebut his argument without using the words racist, bigot or Islamophobe. Try to directly address his argument without citing the Crusades, western foreign policy or passages in the Old Testament.
The Crusades, western foreign policy or passages in the Old Testament do NOT disprove that Islam is a violent and intolerant belief system. That's a weak strawman fallacy and a rationalization and justification for jihadists and the barbarity of Islam.
Also, claiming he's a Zionist shill, Crypto Jew, or Christian fundamentalist with no proof is not an argument. And again - Islam is not a race, it's an ideology. Saying that it's racist to criticize Islam is like saying it's racist to criticize socialism or atheism.
That's not an argument.