The Quran leaves no room to the kind of conjecture trinitarians are known for when approaching their Bible, let alone the Quran. Christians feel comforted whenever they superficially approach the Quran and find these familiar Christological themes. They are sometimes bold enough to assume the Quran is confirming their doctrines. After all, none other than Jesus is referred to as God's word, His messiah or a RUH from Allah. But by doing so Christians are missing the consistent Quranic approach of taking up the major trinitarian themes and labels associated to Jesus, then recasts them in a monotheistic, unitarian perspective. It is the case with the kalima, just as with the RUH/spirit or the name "messiah". Jesus is not the literal nor metaphorical "son of God" but simply, the son of Mary as Christians themselves cannot deny. Similarly, Jesus is stripped from any intrinsic power as regards his ascension and ability to perform miracles. Being the muhaymin/guardian of the previous scriptures and traditions, the Quran could not leave those themes unaddressed. And it does so in an impactful way, using them just as is done in Christian scriptures, while redifining them so as to deny their Christological background.
That corrective function goes beyond these aforementioned pillars of Christology. In the Gospels' eschatology, the trinitarian godhead is at the forefront and Jesus is given the leading role of judgement by his "father" Matt25,26. In the Quran, no possible ambiguity exists as to Allah's supremacy on that day, whether in terms of glory, authority or judgement.
Articles answering Sam Shamoun "How to Become a True Muslim"
