9:2 After six days Jesus took with him Peter, James, and John, and brought them up onto a high mountain privately by themselves, and he was changed into another form in front of them.
Muslims think that Jesus' title of 'Son' means God entered into a biological relationship with Mary, yet in the OT 'Son' is a title rooted in kingship and deity.
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Muslims love to reference Mark 13:32 as a clear indication that Jesus never claimed to be God. Reading the verse out of context and without a wider understanding of the incarnation, does seem at first reading to support the Muslim view. However, on further study, we see there is no contradiction between Jesus claiming to be God and claiming not to know the hour of his return.
Although being one of the earliest parts of the New Testament to be written, Mark’s Gospel shows us clearly that Jesus is God. This counters the claim that John’s Gospel’s view of Jesus was a later development by Christians. According to Mark, Jesus is none other than the LORD himself.
The Textual History of the Qur'an and the Bible, John Gilchrist