God having a plan vs. everything being calculable to us is practically the same thing, no?

No. A supernatural conscious agent with intent (e.g. a god) planning and orchestrating every quantum-interaction is not the same as humans documenting or even predicting extremely complex chains of physical reactions.

Either way, it's still best to act within your moral framework, religious or atheist because it's just better to be a good person.

Agreed. Whether Determinism is true only gives credence to philosophies like cosmic nihilism, and being a cosmic nihilist myself, it doesn't matter that much whether my actions have purpose beyond now. It feels good to be kind, I know how it feels to be hurt, and so I try to do as much of the former and as little of the latter as possible.