If you say that to muslim,he would still kill them as infidels if they do not become muslims,or at least try to.
And christians,jews and buddhists who still belive would try convert them,but never agree to join their faith.
Problem is,they are neither christian or muslim,but some mix.Nobody on Earth would welcome them.
Maybe except druz,who,according to what i learned,are some christian-muslim mix.