Debbie, I'm glad you responded so passionately to the warning I put up. But with all due respect, the argument you make about their scriptures designed to lead people to Hell is not such a strong argument.
The Quran tells us that the G-d of Islam works with Satan and demons to lead people astray in order to populate the hell he has created (Surah 6:39, 126; 32:13; 43;36-37).
Muslims could say that Allah is respecting their free will to choose him or not, and if they don't, they will suffer eternal punishment. This is not too different from the Jewish Bible's incorporation of Satan as somehow part of G-d's plan in the book of Job and the Christian Bible's reference to burning in Hell if G-d is denied. These similarities should not be surprising, since the Koran was lifted from the two previous holy books, with no credit given to the original sources.
What has changed, however, is the bloodthirsty, malicious, sadistic tone, even of divine punishment. This, IMO, and the limited roles of grace, ethics, forgiveness, mercy and love - these are the strongest arguments against the awfulness of the Koran as a base for a belief system. Also, of course, the fact that it is basically a war manual for brigands to justify continues raids on whomever has got the goods one wants.