Read the Qua'aran for starters.
Secondly if you're looking for a Catholic based answer to your question, catholicanswers.org is a great place to post your question.
I will tell you that Qua'aran states that the people of the book are to be respected.
Also Muslims consider Mary to be an Immaculate Virgin but are forbidden to call her "Mother of God"
Additionally Jesus they consider Jesus to be the Messiah but reject the trinity outright. He is considered 'rightly guided' and a great king according to their tradition but they dispute the details of his crucifixion.
Then again they dispute the account in genesis as to why Lucifer was cast out of heaven.
And I might be wrong on this because I am only basing this on the conversation with just one Muslim but they also do not regard Melchezedek to be of any relevance in the overall development of Abraham. From what I was told 'God revealed all to Abraham.' A lot of folks do not understand the significance but it is noteworthy.