[Ali Imran]

You remember when John the Baptist came along and people asked if he was the prophet?

The One that John was announcing was the Messiah, the prophet for whom the people were waiting ....Peter connected the role of Messiah with that prophet and affirmed that Jesus was the Expected One (Acts 3:20–26)....

I hope your doubts are cleared!!

Point 1.
The story of Prophet John being asked that question is found in John 1. He was asked if he was one of the 3 personalities.
1. Elijah
2. The Messiah
3. The Prophet
Prophet John denied being all 3. The point is, that the Messiah and the Prophet are 2 different personalities.

Point 2.
Peter said in Acts that Jesus must remain in heaven until the promise of the incoming Prophet is fulfilled. 

Point 3. 
The warning in Deut 18:20 is serious. We all must listen to God's own words that God puts into the mouth of this prophet. If you say this prophet is Jesus, then we all can take it easy because we do not have God's words that he puts into the mouth of Prophet Jesus. The serious warning in Deut 18 is not so serious after all.

Point 4.
Tell me how is Prophet Jesus like Prophet Moses? You believe Prophet Jesus is 100% God. Was Prophet Moses 100% God too?