ad Taken from here: https://ehrmanblog.org/do-textual-variants-really-matter-for-anything/
Before explaining that, let me deal head on with the objection that no variants threaten any “significant Christian doctrine.” I’m not sure that’s *entirely* true – depending on what one means by the term “threaten.” For example, there is only one verse in the entire New Testament that explicitly teaches the Christian doctrine of the Trinity, 1 John 5:7-8 – “There are three in heaven, the Father, the Word, and the Holy Spirit, and these three are one.” That’s the Trinity – three persons who are all one. The doctrine is explicitly stated nowhere else. But this verse was not originally in the New Testament. It is a later addition.
……theologians will turn to other passages that do not explicitly teach the doctrine in order to provide support for their views that there is a Trinity (for example: verses that say that Jesus is God and that God is God; but the problem is that these verses do not lay out the doctrine that the three are one – so they don’t teach the doctrine of the Trinity [since there are *other* non-trinitarian ways of thinking that both Jesus and God could be God]. Or verses that mention Christ, the Father, and the Spirit: but again the problem is that *these* verses don’t say that Christ and the Spirit are God and that there is only one God – in other words, again, they do not lay out the doctrine of the Trinity. Only this one verse, which was not originally in the NT, spells out the doctrine of the Trinity)