I don’t think a Muslim would go so far as to actually attend a CHristian Church, even one which merely thinks it’s Christian. That smacks of blasphemy and/or apostacy. Both of which are frowned on. I don’t think he’s a Muslim, at least currently, but I believe he’s a muslim sypathizer and appeaser.
Read up on the term ‘taqiyya’ in mooselimb tradition.