Islam Part 1
First and foremost in Islam is the belief that There is one true god, Allah, and Muhammad was his prophet. The view Jesus as a prophet, but certainly not as messiah/savior.
Again Islam, founded on Judaism and Christianity inherits their flaws, however considering their views on Jesus as prophet rather than savior, and other changes they make, it would be unfair to judge solely on that, and so we'll focus entirely on the Qur'an.
We of course begin first with the "all powerful god" contradiction (see rule 2 internal consistency) straight forward, and obvious.
Muslims believe in eliminating all anthropomorphisms (human qualities) from Allah who is not at all like man. This violates the Bible which states that "man was created in the image of God"
Islam also denies Jesus' own words when he claimed to be God himself.
The standard argument is that only the Qur'an is uncorrupted by man. No argument is made to explain why the bible was allowed to be corrupted if the Qur'an can not be (or at least has not been).
Let's start with compulsion. Muslims claim to have a peaceful religion, in which they are required not to force others to join them, but to encourage it. We see this supported in the following verse:
"Let there be no compulsion in religion: Truth stands out clear from Error: whoever rejects evil and believes in Allah hath grasped the most trustworthy hand-hold, that never breaks. And Allah heareth and knoweth all things," (2:256).
However this is then contradicted:
"But when the forbidden months are past, then fight and slay the Pagans wherever ye find them, and seize them, beleaguer them, and lie in wait for them in every stratagem (of war); but if they repent, and establish regular prayers and practice regular charity, then open the way for them: for Allah is Oft-forgiving, Most Merciful," (9:5).
Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book, until they pay the Jizya with willing submission, and feel themselves subdued," (9:29).
The first verse says not to use compulsion (force) to make people worship. The next two say to kill, assault and ambush non Muslims (Pagans and those "people of the book" meaning Jews and Christians). Internal consistency error, in violation of Rule 2 and its own beliefs of inerrancy
and for further inconsistency:
O ye who believe! Intoxicants and gambling, (dedication of) stones, and (divination by) arrows, are an abomination,- of Satan's handwork: eschew such (abomination), that ye may prosper," (5:90).
Truly the Righteous will be in Bliss: On Thrones (of Dignity) will they command a sight (of all things): Thou wilt recognize in their faces the beaming brightness of Bliss. Their thirst will be slaked with Pure Wine sealed," (83:22-25).
Here's my main source.

