Conversation so far:
what does Sam think about Islam?
Harris considers Islam to be "especially belligerent and inimical to the norms of civil discourse," relative to other world religions.
what else does he think about it?
"The idea that Islam is a 'peaceful religion hijacked by extremists' is a dangerous fantasy--and it is now a particularly dangerous fantasy for Muslims to indulge.

Question: has he been criticized for his beliefs?
Self-contained rewrite: has Sam Harris been criticized for his beliefs?