@KatawaGrey Your statement is an assertion of what you believe to be a fact about me. You assert that if I believe a statement of mine to be right, I am an egotist. Now, if you believe your own statement, then you have condemned yourself of the same crime. Perhaps that’s what the Jesus meant with his warning to judge not.
I am not talking about the subjective here. There are things that are objectively correct, and there are things that are simply not correct. It is not possible to function in life without thinking that at least some things are true. Believing that 1 + 1 = 2 doesn’t confirm that I am an egotist.
The sun does not rise in the East and set in the West, even though it seems to. The Earth is not the center of the Solar System. These are irrefutable facts, but both were once held to be falsehoods. Ultimately, the false assumptions could not stand before the evidence. Today most of us still speak of the Sun rising and setting, but we know that what is really happening is our Earth is rotating and creating that impression. And though the heavens seem to revolve around our Earth, we all now know that the Sun is the center of planetary orbits, not our planet.
Believers can believe just because they wish to do so. But we are talking here about those who chose to debate their beliefs—to convince others that their theology is THE ONE. Defending a theology demands one build a logical structure. If there is an obvious contradiction in that structure, it is a flawed structure. Defending it even when the flaw is pointed out is ego in action. Admitting the flaw, going back to rethink your position and question whether it is perhaps wrong, or just poorly thought out and in need of improvement is the intellectually honest thing to do But is not a common trait of mankind. Most humans will cling to cherished beliefs despite significant evidence they are wrong. Look at how long it took the Catholic Church to finally admit the Earth was not the center of the Solar System, even though there is nothing in the Bible claiming it is.
@TheOnlyNeffie Great Answer. I wish I’d said that. :-)