I used to think that Judaism was much more about works than faith but, in remembering that mistake, today I considered how one of the Commandments is about coveting, about what one sets one's heart on. In discussion with Jews, Jesus won agreement in placing special importance on another Commandment, You must love the Lord your God with all your heart, with all your soul, with all your mind and with all your strength.
Today I was also thinking on how Jesus also tells us, Blessed are those who have not seen and yet believe.
Belief must have been easier for Jews during some periods of history. The books of Exodus, Joshua, Kings are full of dramatic miracles, it's easier to believe in a God who blasts altars with lightning and such. It's the same for early Christians, the Gospels (let's include Acts with Luke) also bear miracles in abundance.
What Islam's take on faith and miracles is, I don't yet know. I expect that one's still meant to actually believe in and love God, beyond just doing all the praying and bacon-resisting and charity and whatnot. I don't recall the Quran much mentioning a new crop of miracles but my impression is that there is plenty of subsequent tradition that they happened anyway.
I don't know what Judaism teaches about an afterlife, the rewards I recall from the Old Testament tended to be favor and protection in this life, though Elisha saw something happen to Elijah so that we never know when he might drop in for Passover. Christianity seems to regard faith as critical for both post-mortem salvation and, given human imperfection, significantly enabling works, e.g., it's by prayers of faith that church elders are to heal the sick.
It seems to me to be asking a lot to expect such faith without the miracles or even favors to ground it. God may not have been amused by the thirsty Israelites' wavering faith but they had probably seen enough else by then. If we are to be saved, more big miracles would probably rather help that along.
