5:22 For the Father judges no one, but he has given all judgement to the Son,
5:23 that all may honour the Son, even as they honour the Father. He who doesn’t honour the Son doesn’t honour the Father who sent him.
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Christ in Islam and Christianity, John Gilchrist
The trinity is the foundational teaching of the Bible that God is one God, who has eternally existing in three persons, Father, Son and Sprit who each are fully God. This idea is denied by the Quran, which states that God is an indivisible unity, who can have no partners. The Trinity, while mysterious, is simple to define and a beautiful truth we can confidently hold to and reference in reaching out to others.
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.