Some atheists claim that God cannot exist because unembodied minds are impossible; i.e. that persons must be physical beings. I spoke to this in a 2008 post. Prayson Daniel recently blogged on the subject as well. I would encourage you to read his post. I commented on his post, and wanted to share some points I made that supplement the points I made in my previous post.
This argument begs the question in favor of materialism and atheism. It merely assumes that minds/persons are reducible to brains; that we have no immaterial mind that is capable of existing apart from our bodies. No reason is given for thinking that a mind/person needs a body other than the fact that we are not familiar with it. That’s a very poor reason. It confuses common properties of persons with essential properties of persons.
Thinking to Believe 