Sharia law is not compatible with the constitution.
Everything you know about Sharia law can be written on a business sized envelope.
Everything factual you know about Sharia law can be written on the stamp.
He's still correct though, US Constitution requires separation of Church and State via the first Amendments freedom of religious association. Sharia law requires the Church become the State and enforce preferred religious associations.
That's all that needs to be said about the subject.