I have considered doing a study on Islam at my church, and these are definitely things that I will want to consider letting others know about.
I have also discovered that many Muslims believe in a kind of 'purgatory' for nonMuslims who can attain heaven after a period of time there. I don't know if the Koran speaks of this or not. It's also interesting that they also expect 'Prophet' Jesus to usher in the final judgment in the last days. Why not Muhammad?
It is also interesting that their Prophet Muhammad, who they believe is greater than Jesus, never said that he was God. Jesus did.
Muhammad had many wives, one of which a book has been written about her:

HadithVolume 5, Book 58, Number 234:
Narrated Aisha:
The Prophet engaged me when I was a girl of six (years). We went to Medina and stayed at the home of Bani-al-Harith bin Khazraj. Then I got ill and my hair fell down. Later on my hair grew (again) and my mother, Um Ruman, came to me while I was playing in a swing with some of my girl friends. She called me, and I went to her, not knowing what she wanted to do to me. She caught me by the hand and made me stand at the door of the house. I was breathless then, and when my breathing became Allright, she took some water and rubbed my face and head with it. Then she took me into the house. There in the house I saw some Ansari women who said, "Best wishes and Allah's Blessing and a good luck." Then she entrusted me to them and they prepared me (for the marriage). Unexpectedly Allah's Apostle came to me in the forenoon and my mother handed me over to him, and at that time I was a girl of nine years of age.

Those are some things I have come across from my research. Hope it helps too.