"What legitimacy do those who feel faith is immoral." -
The word “faith” is a very misleading ambiguous one in common words. As I experience it, religious people try to justify having faith by equivocating between different standard meanings of the word.
I could have faith the sun will come out tomorrow morning. (Based on past experience and very rational)
I could have faith in the legal system. (Based on a sometimes over-credulous faith in human nature, and a little less rational)
I have faith in a deity. (Established on myth, totally irrational and without reason)
My take is that we are not talking about the sun or the legal system. Faith is trust in an idea, or a feeling that is unsupported by evidence or lacks proof. I know most people don't conform to religious claims through and/or thoroughly. And I will never hold someone accountable for faith in and of itself, but look at the behavior which may or may not result from faith.
Those who want to especially praise faith as a virtue (rather than denounce it as a vice as I do) have a stake in clarifying what "faith" is the one we are talking about.
There are distinctly different circumstances in which people not merely hold a belief unsupported by evidence, but do so knowing that it is unsupported by evidence. These people believe out of commitment to the belief itself, independent of the degree of evidential support for the belief. They might believe it while thinking that there is no evidence for it (that's dishonest). They may perceive themselves to believe it more strongly than the evidence for it alone would justify (also dishonest).
The problems begin when people believe more strongly than their own perception of evidential support warrants, or when they believe against what their perception of the evidence weighs in favor of, or when they implicitly or explicitly commit themselves to continue believing even should further evidence counter their belief. (lying)
Faith, is the word believers reach for themselves when they are out of arguments and even insist on believing anyway, or when they try to justify why they believe things that they themselves do not perceive adequate evidence for (intellectual dishonesty).
I have encountered believers on this forum, who debates about beliefs and then outright say that they will not change their minds no matter what evidence or arguments are brought. They are committed in principle to believe their religious beliefs no matter what the evidence says. And even they would like to “reason” with others and insist people have to have an open mind and heart to accept their beliefs. (deceiving)
That's dishonest and morality involves conscious choices, including the choice to act in a manner that increases someone else’s moral good. If you are being dishonest (lying, deceiving), it's the opposite of a moral act.
So yes, it's immoral,
Ismael