Agreed, but being in error about a non-theological matter or most theological matters even, does not mean one cannot be a Christian. Just like spouting the most correct theology does not make one a Christian.
I have opinions about certain folks who claim to be Christian (Obama, Hillary, etc.), but in the end, I try to leave this judgment to God.
Well, the Bible is not unclear as to the definition.
Lying is a breach of the Ten Commandments. So far, this self-professed Christian is lying about the existence of a “nakba” and being “Palestinian”.