Soul

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...but your whole reasoning was based on that "numbers are immaterial" therefore "brain cannot compute it"...but now you are saying, the brain does compute something immaterial...

No no no, the brain computes no immaterial. The soul computes nothing material. "The brain uses numbers with the soul" is not to mean that immaterials are processed in the brain, but that the brain and the soul process simultaneously. The soul processes the immaterials and the brain the material.

Moreover, us not touching "6" when we touch "6 marbles" is not obvious to me as a sequitor conclusion.

I actually don't know how to combat this other than repeating what I've already said. The only examples I know with quantity revolve around, "You cannot take a quantity, paint it, and then use it to chop down a tree". If you can touch "6" by touching the marbles, pick up the "6", and leave the marbles.

Moreover, in a dream, what we are dreaming of is not real. It's imaginative. But you said this doesn't prove a soul existing. So why can't we have imaginary numbers in the world of our consciousness if we don't have a soul?

Well, imaginary numbers do exist, but not in reality. Sqrt(-1) doesn't exist ens reale (in reality), but it does exist ens rationis (in the mind). Understanding sqrt(-1) does mean we have a soul, but not for reasons by quantity. Sqrt(-1) is necessary in equations. Understanding equations is beyond the animal soul we've been speaking about, but is rational soul only.