Wouldn't determinism have been "easier?" If there is no free will, non-determinism seems like a lot of trouble to go to for nothing!
>Wouldn't determinism have been "easier?"
This question doesn't really have any meaning. Easiness is a concept imagined by humans in the context of our own endeavours. And even if you suppose a sentient creator similar to ourselves, we still have no means to judge what kinds of universes would be easier or harder to create.
With as many neurons and synapses as we have, there is more than enough complexity to expect the mind to be purely physical. I don't see why that bothers so many people; I think it's incredibly awesome.
Is it not possible that the brain simulates the experience of qualia (itself a philosophical zombie) but that this process is what causes the non-physical mind to exist, and to experience those qualia?