Jesus said "I am the way, the truth, and the light", "no one can come to the Father, unless through Me". He also talked about the wide path/narrow door & that many false prophets would come to Him claiming to have done good things in His name but, that He would turn away from them, saying "I never knew thee".
Clearly, there is an objective standard. Not a "subjective" line.
I did not say that there is an objective standard for salvation.
I said that there is a certain subjectivity in our language when referring to things as being "the same". Your quotations are irrelevant to this.
How do you reconcile three religious movements (though monotheistic) that deny Jesus' role as Christ, and one of the three denying God as both Father AND Son?
I don't reconcile them. I think others are wrong about God.
You never responded to my question about oranges, by the way:
Imagine that there is an orange on a table between two men. One man claims that the orange is an orange, and that it is a sweet fruit containing seeds with a harder, bitter "skin" around the flesh. The other man claims that the orange is an orange, and that it is a sweet fruit containing seeds with a harder, sour "skin" around the flesh. Do we insist that both men are talking about different oranges? Of course not! We simply conclude that they are both referring to the same orange, and that one (or both!) of them is just wrong about whether or not the peel is sour or bitter.