Deedat focuses on one verse in the Bible.
Deuteronomy 18:18 I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him.
He believes this is talking about Muhammed and uses a few other verses to support his opinion. This idea was first used by Al-Samawal al-Maghribi, a medieval (12th century) Jewish mathematician who converted to Islam, in his book "Confutation of the Jews." The New Testament clearly states otherwise.
John 1:45 Philip findeth Nathanael, and saith unto him, We have found him, of whom Moses in the law, and the prophets, did write, Jesus of Nazareth, the son of Joseph. (cf. 1 Tim 2:5)
It's as simple as that. Deedat points out the differences between Jesus and Moses and believes Muhammad is more like Moses. Here again, the Bible explicitly explains who it is talking about.
Heb 3:1 Wherefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our profession, Christ Jesus;
2 Who was faithful to him that appointed him, as also Moses was faithful in all his house.
The likeness is in their faith. He also mentions that the Jews were expecting Elias and John the Baptist claimed not to be Elias (John 1:21). Elsewhere it says that John the Baptist was Elias (Mat 17:13). Jesus explains this.
Matthew 11:14 And if ye will receive it, this is Elias, which was for to come.
If the reader can accept spiritual fulfillment (2 Cor 3:6), then John the Baptist is Elias. John the Baptist knew the priests and Levites couldn't accept this. Christians of the past such as Joachim of Fiore (1135-1205) and Martin Luther (1483-1546) have associated some passages in the Bible with Muhammad including Daniel 7, Revelation 9, 12, 13, and 17.