Isn’t pantheism the same thing as atheism?

[Ferrocyanide]

Spinoza was a hard determinist. To him, nobody has free will. Not even God. If you and I count as beings, but are merely a collection of matter doing what matter does, why can't the entire universe also count as a being?.... designated as "God"... but just like you or I... God can only unfold due to it's nature and prior causes.

A God without the ability to make choices is not a God by the usual definitions.  He is powerless rather than powerful.  

There are 2 kinds of systems: deterministic and non-deterministic.

You can be a deterministic system and also make choices.

For example, you can build a robot that walks and when it reaches a wall, it stops.
That’s an example of a robot that is making a choice to stop.
There is
data input -> which leads to -> thinking -> which leads to -> decision making

The robot is just running an algorithm.
-----------------------
if(close to wall)
   Stop motor;
else
   Keep running the motor;
-----------------------

If you want that to be non-deterministic, then you want it to be random.

The algorithm might be something like this
-----------------------
value=RandomNumberGenerator_0_or_1();

if((close to wall)&&(value))
   Stop motor;
else
   Keep running the motor;
-----------------------

A brain just runs algorithms. A human brain has parallelism and is a neural network and so, there are differences between a human brain and a CPU like your Intel i7 and AMD Ryzen, but these CPUs are general purpose. You should be able to create a program that approximates the human brain, although, it will run slow.

Anyway, like I was saying a brain just runs algorithms.
If you want it to be non-deterministic, you would have to insert some randomness here and there.
If you have too much randomness in the decision making process, that brain is going to behave erratically.