I think when you know both God and Satan are real that is a starting point for holding faith in the rest.
The apostles didn't always understand the teachings of Jesus.
That's likely part of the reason many of them walked away while others stayed faithful.
Sometimes understanding was hidden from them. It wasn't yet time for the message to be understood.
But then after Jesus was glorified everything appears to have cleared up for them. Which is why we have the synoptic gospels.
I'd say don't be discouraged by how you feel. When you know you firmly believe in God that's a great place to be.
It sounds like you're open then for God to lead you to understanding. Because you aren't firmly predisposed to ideologies, dogma, etc...
God firmly believes in you too. :)
You'll be just fine.
God bless.
Much appreciated