It is very simple to determine that Islam is a False Religion. One need not look any further than the Qur'an itself. However many Muslims never actually read the Qur'an. It is completely unconscionable to me not to make an effort to read the Holy Book of the God you are intending to spend eternity with. So many take the wide path to destruction and listen to what Imams tell them and follow them. Muhammad is actually only mentioned four times in the Qur'an versus.
This video goes into detail about what the Qur'an actually says. The Qur'an actually says that one must refer to Holy Bible for the true scriptures to compare against what is said in the Qur'an. In that the Holy Bible takes prescience over the Qur'an according to the Qur'an.