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In case anyone's wondering, I suspect that the "one single verse [...] taken completely out of context" is John 10:30, "I and the Father are one". To the best of my knowledge, this is the only place in the Bible where Jesus seems to directly claim to actually be God rather than doing his work, representing/channeling his authority, making allusions to prophecy, etc.. The context can be read as suggesting that he was saying they are intimately linked and united in purpose rather than literally being the same entity; of course, the vast majority of Christians are Trinitarians and thus reject that interpretation.

[tsm]

This doesn't contradict Trinitarian theology, by the way—Jesus and God being one falls into "three in one and one in three".

It's perhaps also worth noting that trinitarianism is so fundamental to mainstream orthodox Christianity that mainstream orthodox Christians consider it deeply heretical to reject the Trinity. This was a major result of some of the early ecumenical counsels. They put together the Nicene Creed (and by virtue of being a "creed", not a "catechism", disagreement with it is heretical by definition) that defines the three persons of the Trinity, including "Jesus Christ…eternally begotten of the Father; God from God, Light from Light; true God from true God; begotten, not made; of one being with the father"