Never forget this - even the devil and all who follow him believe in God. They don’t want you to have faith in God, though, because that’s where the power is. It is our belief in God and His word that is mountain-moving, devil-defeating faith!
Decades ago, I learned an amazing truth about Believing God from @bethmoorelpm study by that name. I still remember and remind myself of these truths.
I believe that God is who HE says He is.
I believe that I am who God says I am.
I believe that God will do what He says He will do.
I believe that I can do all things through Christ.
I believe that Gods word is alive and active in me.