A spiritual person is one who seeks to elevate himself, to connect with a higher power, or simply his higher self. He believes there is more to the world than what is easily seen, than what is merely physical. He will have certain guidelines of behavior and diet that he will go by, but all in the name of properly attuning with the infinite and entering some higher state of consciousness.
That seems to knock me out of the spirituality business, then.
"Properly attuning with the infinite" comes over as pseudo-profound wibble designed to sound impressive but which actually conveys no informational content whatever.
My guidelines for behaviour and diet are: try not to be a dick (the Atheist's Commandment), and eat whatever tastes nice without robbing another sentient creature of its existence, respectively.
Whether there is anything that is more than merely physical I don't know. I don't know how it would be possible to know. I do know that I've never been furnished with any reason to think so. The very physical world and the experience of being in it seem inexhaustibly marvellous to me as they are, without add-ons.
Perhaps this is a definition of the fundamental difference between believers and non-believers - the former are the ones for whom the world as it is is never enough, and who want to pile on that extra layer of gods and devils, angels and demons and whatnot.