As John Ortberg points out in If You Want to Walk on Water . . . , most of us are a mixture of trust and doubt. During our desert transition times, our Land Between, doubt often becomes the more predominant thought process.
Rev. Ortberg offers this wise counsel: “When people wrestle with doubt, they may tell themselves that they will try harder to have more faith. But faith is not the sort of thing that can be acquired by trying harder . . . . Never try to have more faith- just get to know God better. And because God is faithful, the better you know him, the more you will trust him.”
You don’t need “this is most certainly true” faith, just enough to take a step.