We return to an important question, the problem of trust "something" (yes I'm straw man) everyone can believe in whatever he want, but he should not oblige the other to do the same. It is normal all the Muslim believe in the Quran, and it will be most difficult to comvince the other . I remember that one tune my Muslim friend asked me to join the Islam and I've replied to him "I will join only if your religion is better than mine".
I agree with you on freedom of each person to choose even if he or she was born into Islam they should have freedom to leave, whatever.
But the thread here is on the Debate Position that there are No Miracles in the Koran. By contrast the New Testament is full of "Miracles."