There is a former Muslim Imam, Mario Joseph who became a Christian after studying Quran. It started one person asked about who Jesus was. He tried to find out Jesus in the Quran and he compared Jesus to Muhammad. Soon he found out Jesus was superior than Muhammad. After he became a Christian, his family tried to kill him but God allowed him to escape that situation.
In order to go to heaven, we have to repent our sins and accepts Jesus as our Savior and the Son of God who died for our sins. Jesus is the only way to heaven!
To see more testimonies from former Muslims,
http://www.muslimtestimony.com
To see more testimonies of heaven and hell,
http://www.heavenvisit.com
