Actually, as a Christian (Catholic), I 100% agree with your assertion. While all regions claim truth, Christianity really centers itself on this idea.

In fact, this is repeated over and over again, so much so that I've lost count of the number of times I've heard the following during Homily: "In Christianity is not true, and Christ was proven to not have been risen, we should stop practicing it".

You quoted Saint Paul which is great and one can find plenty of other examples such as Lewis's trilemma: "Lord, Liar, Lunatic". [0]

[0] https://en.wikipedia.org/wiki/Lewis%27s_trilemma