Hi Gus,
Thanks for your post. I think this is a definitely a common reality within religious discussions, that I, who identify as a Christian, also find to be quite frustrating, and I recognize that I have used this circular reasoning before.
As a Christian, faith is definitely a significant aspect of my religious adherence, and in the Bible, it is often upheld as a virtue. I am not necessarily providing any sort of argument, but rather I would like to provide a better definition of
faith, what it is and what it is not and hopefully this will add some value to the conversation.
Take the phrase, "a blind leap of faith". Unfortunately, I think that many Western Christians adhere to this sort of faith when the argument boils down to your mentioned point of frustration, however I do not believe this is what faith actually is, nor do I think that the Bible and Jesus depict it as such. First, I'll offer one example (there are plenty of others), in which we don't see faith as a lack of evidence.
1. Doubting Thomas (John 24:24-29)
I am not sure how familiar you are with the Christian gospels, but one relatively well known story is that of one of Jesus' disciples, Thomas, who got the unfortunate label of "doubting Thomas" because he does not believe that Jesus was raised from the dead, solely on the basis of the other disciples telling him. It is not until he sees the wounds in Jesus' hands, feet, and side that he believes (don't ask me why Jesus wasn't just raised back perfectly healed, I have never really thought this through), and Jesus responds by saying, "blessed are those who have not seen, yet believe". Although some people seem to draw the conclusion that Jesus is saying it is better not have evidence and believe (blind faith), this is not at all within the text. Additionally, it isn't at all the case that Thomas doesn't have evidence before he believes (he does: the testimony of the other disciples), however he receives additional evidence which leads to his belief.
Faith is not the belief based on no evidence, in fact there are plenty examples we come across that we would still say require faith, but there is plenty of evidence. I'll provide a personally applicable one.
I just recently got into rock climbing (quarantine things am I right?), and there is a ton of evidence that it is perfectly safe. The rope I am using is rated to 8 kilo-newtons, the bolts in the rock can hold 6000lbs of force, the carabiner can handle 22KN, and... you get the idea. All the evidence points to the fact that I am perfectly safe, however I think it's still applicable to say, "I have faith that I will be safe" or "I have faith in the equipment".
Hopefully this understanding of faith helps. Additionally, I would just input that I think that there is good evidence for theism and the Christian tradition that I have chosen to be a part of. (To name a few in regards to theism in general: the Fine tuning argument, the necessity of God in our principle of causation, the phenomena of morality. In regard to Christianity, the nature of the message, its survival as unappealing as it would be for the earliest Christians). I also won't deny that there is evidence against Christianity and theism as whole (biggest one for me is the problem of evil), but all in all the evidence seems to lean towards the reality of the Christian God, and that is what I put my faith in. Hope this helps!