This is my own brief account of apostasy...
"Well to mention just a few thoughts that caused me to doubt and drift me away from Islam; The lack of evidence for many of the absurd and wild claims Islam and Muslim apologists make, evolution/creationism, other flaws in Islamic scripture, questionable, oppressive and harmful rulings/practices and why an omnipotent deity, dispatched his final revelation to all humanity (via a 7th century superstitious and presumably illiterate Arab), in a region/time, with not much of an established culture of producing much written records or widespread literacy, in an antiquated language to which the vast majority of humanity, throughout human history have never been familiar with. A terrible method of communication I believe, unless the author of the Quran was just a mere fallible human, like a certain 7th century Arab, in which case such a method of communication (and content) is understandable, given the cultural contacts, limited abilities and fallibility of humans i.e. 7th century Arabs.
If this, presumably highly intelligent deity, so desires that all humanity acknowledges his existence and proceed for us to worship, then in his omniscience he knows just what it would take to convince every single individual and remove all doubts and in his omnipotence he could easily achieve that and his ideal outcome, for God is not incompetent, limited in his abilities or fallible. Unless of course, "God" is a certain 7th century Arab; in which case it's understandable why such an approach is not taken."