The faith can be tiny and still grant you superhuman strength because the strength comes from the Holy Spirit, not from you. Just as eternal salvation comes from Christ and not from what you think about some particular passage in the Bible. He doesn't need our help to save us.
We simply face the decision of whether we accept that salvation and join Him in the Light forever, or stay apart and alone, in the Dark, outside of communion with Him. We have to consciously choose, even if we don't really understand it or have questions.
Literally.