you dont necessarily have to be a theist to be spiritual. I hold no belief in a god what so ever, but I when asked what my religion is I still say "Thelema", even though I no longer believe in the Egyptian gods or Holy Guardian Angels (or Roman gods that I mentioned in a previous thread,) because I believe the two basic tenets "Do what thou will shall be whole of the law" and that "every man and every woman is a star." Plus I am a very active member of my local Narcotics Anonymous group so spirituality plays a huge role in my every day life (you know "honesty", "open-mindedness", and "willingness")
I also meditate, practice yoga, practice magick, and even pray, but my prayers are directed towards my Will, not any form of a theistic god.
But back on topic... I am in a very nice relationship with a Christian who believes in a literal heaven and hell and the Abrahamic God. Humanism and tolerant Christianity have many similarities. Me and him both agree that people should not be forced to do anything that they do not want to or be intentionally harmed unless in self defense. He treats me like a queen and respects my lack of beliefs, I treat him like a king and respect his beliefs. So yes I would date a theist.