You say:
“For example, Orthodox synagogues have a partition between the men and the women. Would he leave a synagogue?”
Well for one reason, Orthdox Jews don’t fly planes into buildings or do honor killings and don’t kill people who don’t believe in their ways.
He knew it wads a Muslim wedding when he went. Thos things you mentioned are wrong, but does that mean everything Muslims do should be banned? Should we ban belief in God because Muslims believe in God? That’s what it will come down to. He knew