Hi NASAg03
Thank you for asking this question. Well, I know that you don't believe in the Quran as God's word. But you do believe in the Bible. The Bible foretold about Muhammad (Peace be upon him). In this post I will try to give you some examples. Of course I have much evidence that Muahmmad (Peace be upon him) is a prophet, but I prefer to prove it from the Bible so as to have a common ground only. In this post I will begin with the first prophecy:
Genesis talks about God's promise to Ishmael:
Gen 17:20 And as for Ishmael, I have heard thee: behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.
Gen 21:18 Arise, lift up the lad (Ishmael) , and hold him in thine hand; for I will make him a great nation.
The Arabs have been very weak and neglected till Muhammad (Peace be upon him) came, after God blessed them with Islam, they became a great nation and Islam was prevailed.
Look also at the word "I have blessed him", if Muhammad (Peace be upon him) was a false prophet, God wouldn't have said blessed him, because God won't bless with a lier, but the blessing must be with a prophet who was Muhammad (Peace be upon him).
Waiting for your reply
Thanks