Jesus and Christianity are not above criticism, many people have mocked Jesus, even the Koran mocks Christianity, claims Jesus was not the Son of God, and he was even a Muslim and not a Jew.
However, Christianity and Christians always stands firm in the heat of criticism. In fact as christens we are called to continually test that what is presented as truth.
1 John 4 “ 1Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.”
If something is true then it can within the test of criticism, while a false prophecy cannot, therefore one needs to question the motive to silence the criticism of Islam, as if what are they afraid the world or themselves will find out?
And do you ever notice the MSM always uses the term "the prohet Muhammed" but never the "Lord Jesus Christ?"