Most people are relying on faith, which in my opinion is something they should not do
Faith might be called as speculation, and that's what bitcoin is based upon.
So, if relying on faith is not correct according to you, then 1000 USD would not have been possible before.
You are right. But even within the speculation, we can distinguish between bets that are relatively safe, and these that are completely wild, not based on any (reasonable) arguments.
I can write, for example, that the price of Bitcoin will be 3000 USD next. I'd love that prediction to come true (and I guess everybody around in here), but I know that this practically impossible.
I have a lot of evidence around that makes me think that the price won't rise to $3000 next year.