Or thou have a house of gold or thou ascend into heaven; and we will not believe in thy ascension until thou send down to us a book that we can read. Say, Holy is my Lord! I am not but a man sent as a messenger. (17:94)
Those Muslims who believe in Jesus to have physically ascended to the heavens, in fact, help the case of Christians. If Jesus has indeed ascended to the heavens and will return some day, then this verse is sufficient to prove his supra-mortal status, which is exactly the Christian claim.