The most important reason anyone is an atheist

[Sword of Christ]

First of all, if you divide something in two, you don't have two of the original thing, you have two halves of that thing, so epic math fail, there.

We essentially have two brains connected together, like you said the connection can be cut for interesting results.

Secondly, in some respects that person ceased to be one being; there were two states of mind, in the last example I gave you.

It's not possible for the same person to have different states of mind?

I've never seen a person so completely misinterpret the written word before now; you've literally derived the complete opposite of what I said.

People who have a split brain essentially have/operate two different brains each with their own individual character traits. Apparently in this case only one of these brains/hemispheres has an awareness of God which is interesting.