I believe what I believe (as we all do), because if we thought we were wrong, we'd change our minds and believe something else.
It doesn't seem this is true for everyone.
Faith allows one to believe in something with impunity even if that belief is shown to be wrong compared to the facts of reality. I'd agree with this claim that we'd change our minds if we've arrived to our previous beliefs by way of reason and evidence and not faith or indoctrination.
That said, I am but one person in a world of 7.2 billion, so it would be the height of hubris for me to assume that what I believe is "the ultimate truth" while dismissing the beliefs of over a billion Muslims (or, for that matter, 2 billion Christians).
This is totally Fe and utilitarian, lol. You're a fine representative of an Fe dom, lol. It's a logical fallacy to think something must be true, at least in part, simply because a large amount of people believe it to be so.
Islam must have some beauty and utility. Otherwise, there wouldn't be over a billion people on the planet who share that faith.
This is an Fe judgment with
must. You see that?

Thousands of people (if not millions) believed in Hitler's vision of Europe yet I don't think beauty is a word to best suited to describe it when objectively measured against the facts.
I feel I have no right to criticize or condemn Islam.
Sure you do if there are core beliefs in that religion that conflict with your sense of values or the social values you espouse. Clearly many Muslims do not feel such inhibitions as you do when they criticize and condemn Western culture.
Many Christians are not so generous. In that sense, at least, Islam is, in fact, more tolerant and accepting of different "paths" toward spiritual enlightenment and eternal bliss.
But most of Christianity has had the benefit of being directly effected by the Enlightenment so, for instance, choosing to leave Christianity (give up one's faith) for another religion or no religion at all isn't punishable
by death. Due to enlightenment values Christianity is merely a religion and acts as a personal guide for most of its' believers to live their own lives. It is not a political system of governance such as Islam. Islam is just as much political/social as it is religious given that the religion has its own clear rules and guidelines over jurisprudence and law ( Sharia). This doesn't only bring Islam into conflict with other religions on theological grounds but it also brings Islam in conflict with whole systems of law in different nations ( particularly Western) on legal grounds.
Fe is noted for being "open" and non-judgmental.
Fe derives values from external harmonization between society/people rather than an internal barometer of a personal repository of feelings so I guess that makes it 'open' but I still think its judgmental like any T/F function.
Even though F is a judging function, Fe users don't judge with Fe. It's a neutral, input function. I see no need to "judge" Islam. If a billion or more people like it, who am I to say that they're wrong?
I don't think so. Even some of your comments in this post came off as judgments such as X
must be X.

In fact its is a judgment of yours not to judge Islam merely because a billion people believe its true. You're using a utilitarian argument to justify your conclusion and the minute you draw a conclusion you are making a judgment.
Now if its just you saying they're wrong merely because you have a feeling that they are wrong then I agree, it's not a very good argument. However if the facts of reality on your side and you can demonstrate that through logic and evidence then you can say a billion people are wrong. A few hundred years ago the majority of the Earth's population believed the Earth was flat and the center of the universe until a minority of skeptics challenged that narrative. Disagreement with the majority drives innovation and knowledge.
