We believe that throughout the history of mankind, god has made different men prophets/messengers.... their jobs have been to spread islam around... the first was adem (adam)... then came others like nuh (noah), ibrahim (abraham), musa (moses), isa (jesus), and mohammed.... as you can see, many christian elements are here.... but the difference is, we dont believe that jesus is gods son, hes just a messenger (the 2nd last one) like the others... so jesus doesnt have as much impact on our religion as in christianity... and becoz of our views of him, the stuff about sacrificing himself from mankind, being gods son, etc. is not considered valid in islam... mohammed came after jesus, and he was the last messenger, because he achieved in spreading islam around the world... but he was still simply gods messenger, not a relation of god (allah) because we do not believe that god has any sons, daughters, a mother, or a father... he was the first messenger to spread islam around the world, therefore there was no reason for more messengers....

but to answer your question: we DO believe in jesus... but we consider him simply a messenger (the 2nd last one), not the son of god