Ok, found what I was going to ask:

So Muslims believe it was actually Ishmael? Can someone tell me how this story is written differently in the Quran (sp?) to portray the different beliefs (i.e. which child was actually the child of promise). Interested to know what it says differently. Thanks guys!
And found this from Niass too that would be interesting to know I reckon:

um, I have another question about Islam... I was driving around earlier thinking about this thread and and wondered how is the begining of the earth told. Like in the bible and Genesis starts with "in the begining was the word and the word was ..." and then continues to tell us about the creation of earth and animals etc and then adam and eve and the tree of knowledge etc...is it similar or the same or completly different?
When I looked back through the posts I also found this:
It does state in the Bible that the Qu'arn was given to Mohammed... again, I need to look up where exactly. But I can't believe that God would give His people so many different religions and then expect us to pick which was divine - they all are.
Is this true? Anyone know? I have never read it....would be interesting to see...

ETA: sorry if anyone has answered these and I've missed it, this thread is getting pretty long lol.