Both of these have to be assumptions in the model. Its the model itself that has to be proved to be more useful than the current one. For example:
I’ve already seen here where others have disputed that this is the only thing required for evolution to create the complexity we see today starting with a cell.
If a front-loaded design model, with evolution happening on scales different than the current understanding works better, and models what is actually happening, then that’s what should be accepted by biologists.
God is the first cause. He is omniscient and so is the original designer and has no need to acquire knowledge. The purpose of design for us as humans is to acquire knowledge. We do acquire this knowledge by studying His designs. That’s what all of science is. It doesn’t work without a first cause that is consistent in His designs.