to deny the existence of a spirit is like denying God. God is a spirit, he is not of fleshly form (at least thats the way I understand it), Christ was born of the body and resurrected in a body that was more spirit than flesh. God even sent a comforter to stay with us till Christ returns the holy spirit! to die is to pass from this life unto the next which is a new life were we exist in a spiritual body. So spirits/ghost do exist as far I can understand!