The biggest thing lacking in Islam is liberty. It is the freedom of
will or free will. A person may become a muslim, but once he/she has
becomes muslim, he/she may not leave it. Apostates are killed in Islam.
Muslims whether born into Islam or converted are not free to choose their religion. No Islamic country allows Muslims to leave their religion and become Murtad. The penalty for apostasy in Islam is death and if someone is caught preaching his religion to a Muslim he will be put to death. Every year in Pakistan alone hundreds of Muslims are murdered or executed for leaving Islam and converting to Christianity.
Yet every year thousands of Muslims do manage to give up the bonded slavery of Islam to become a child of God. Many of these are murdered in cold blood as per the directive of Muhammad, the founder of Islam. "The Prophet said, If somebody (a Muslim) discards his religion, kill him" (Sahih Bukhari 4.260). Yet every year many do manage to escape the cult of Islam and become the children of God. The figures are stagering - 10,000 in India, 5,000 in Iran, 10,000 in Indonesia .....totalling to one hundred and fifty thousand per year.
Here are a few testimony videos of muslims who have converted to Christianity. Former Muslims tell what drew them to Christianity and the problems with Islam. A Great resource to share with your Muslim friends. Using these Videos Christian Evangelist Rashid Alamir, who himself was a former muslim has managed to bring thousands of Muslims to Christ in the last few years in India.