Christianity (in particular) puts quite a lot of emphasis on "faith". Preachers love to talk about how faith is a requirement, that we cannot require or expect proof from God, at least not in the same way we might expect and require proof from a scientist talking about his new discovery. To be a true follower of God you must believe in Him, largely on the basis of faith.
But what seems so odd to me is that few of the figures mentioned in the Old and New Testaments were required to have the sort of faith we are now expected to. The key figures in both Old and New Testaments all had direct and unambiguous contact with God, Jesus, and angels. This direct contact was not made only to the deeply faithful, it involved those who had no faith, those who had only marginal faith, and those with whom the concept of faith didn't even apply. God proved Himself to Moses by His appearance through the burning bush. God spoke directly to Abraham. God (as Jesus) proved Himself to the Apostles and many an average citizen by walking among them and performing indisputable miracles in their very presence. God (as Jesus) proved Himself to Saul (who became Paul) by converting Him through a personal appearance. God appeared, sent angels, or sent visions to most of the other major figures in the Old Testament (Adam & Eve, Cain, Abraham, Job, Isaac, Mary, etc.). How could these people in the Old and New Testament not believe in God when He was directly interacting with them, proving Himself to them by His words and His deeds? If Jesus appeared before me today and raised someone from the dead I, too, would absolutely believe. If God appeared and spoke to me tomorrow through a burning bush (that was not consumed) I would surely believe. If God spoke to me from the heaven's to ask me where my brother was, I would believe. How could anyone doubt what was so self-evidently true? But why are we now expected to forgo the proof and/or validation provided to all these figures we are taught to respect, emulate, and admire? Why did God or religion change these requirements? Why are we expected to be more "faith"-ful (in the sense of believing without proof) than the Apostles, than Saul (Paul), than Moses, than Abraham. I do not believe I can or should do that.