But the reality is that they agree on more things than they disagree on, especially the most important items. I grew up in a Protestant church but didn't convert to Catholicism until I was 30, so I've had extensive experience in both.
And I used to teach a comparative religions course, whereas we did visitations, plus I also brought in speakers from numerous Christian churches, and also synagogues and mosques. I can go to any of their services and feel at home, with the exception of the fundamentalists that take the "my way or the highway" approach who tend to strut around like peacocks "thinking" that they have all the answers.
Again, the key is understanding the concept of "essence" and how it is used, especially since the NT was written in Koine Greek. "Essence" was a widely used concept with the Mediterranean scholars back then and afterward, and this is by no means the only Greek-influenced concept that shows up in the N.T. One sees Paul's Greek education being reflected in his epistles, for another example, especially his use of dichotomy.