This thread was mainly about believing "enough" to receive healing/blessings/gifts from God rather than believing enough for salvation. The "prosperity gospel" is chiefly concerned with material blessings in this life here on Earth. Salvation is "kindergarten" while "spiritual blessings" are the "meat" for mature believers.
I remember one church I attended for a short time that was massively bound up in what can only be described as cognitive dissonance (or plain outright denial).
One particular individual was diagnosed with a nasty disease (I forget if it was cancer or something broadly similar, but required ongoing treatment). He insisted that he believed he was healed but continued to visit the doctor, thereby indicating he didn't believe he was healed. After all, if he was healed he wouldn't need to go to the doctor.
The same church wrenched Job 22:28 out of context and used it to claim that they could declare things and they would come to pass. They spent much time "breaking curses" (but could never say what specifically it did or how it changed anything), they had a passion for repenting for past sins (sins committed hundreds of years ago, that they had no part in committing), and endlessly declared that better things were just around the corner. Yet at the same time the church remained perpetually needy, the endless ramblings from the profits prophets they followed never came to pass (yet the endless failures apparently never accumulated to a trigger to stop following the obvious false prophets), and despite declaring themselves prosperous were unable to pay the bills.
Their solution to everything seemed to be little more than to declare something again but with added faith. Last I heard an already diminishing congregation had split in two for reasons unknown, although from what little information I have it sounds like both parts are following similarly unproductive paths.
Fundamentally the issue was that they were seeking a blind faith, rather than a qualified faith. If I stand on the bridge once and see it supports me, I have faith it will support me a second time. If I see a truck drive over the bridge I have faith it will take my weight as I walk across. If I see a rickety old bridge over the river that clearly won't support me but insist that I believe it will, chances are I'm going to be getting wet however strongly I believe in that bridge.