You have to transmit to them what its like being in the theater. And it has to come from somewhere inside you and not by being like what somebody did last year.
All religions have some truth in them, but none has the whole truth; all are created in time and finally decline and perish. Mahomed himself never pretended that the Koran was the last message of God and there would be no other. God and Truth outlast these religions and manifest themselves anew in whatever way or form the Divine Wisdom chooses.