the word of ALL prophets is impoortant as it is the revelation of god from god speaking to them.

Prophet Muhammad (pbuh) is significant because he is the last prophet or messanger to mankind, and god revealed the last revelation to mankind to him, and this is the only "word of god" available to man in an uncorrupted and authentic form.

on the point of the ascension of jesus, according to bible experts this is not proven and is widely doubted which is why many bibles do not included it as it was not included in early bible manuscripts, cannot be authenticated, and may have been made up by man. this is why mark 16 ends at verse 8, and verses 9-20 are disputed as the early bible manuscripts didnt include them. Just as the bible does not say he was god.

muslims believe thatjesusdid not die on the cross and he was raised up to god as this is what is stated in the quran