To be in relationship with truth or God is to be spiritual. Remember, to be in relationship -- not to talk about spirituality, not to follow a certain creed, dogma, church, but to be in direct immediate relationship with existence is spirituality. To be in tune with the whole, to feel the harmony and the joy and the sheer celebration of being here, that is spirituality.
It has nothing to do with going to the church or the temple, it has nothing to do with reciting the Koran or The Bible or the Gita. It has nothing to do with any kind of worship ritual, it has something to do with communion -- communion with the trees, communion with the stars, communion with the rivers, communion with all that is. It is communion with this multidimensional expression of God, it is having a dialogue with the whole. The quality of mad love is needed, then you are spiritual. Spirituality is not a head trip; it is a heart-to-heart dialogue, and ultimately a being-to-being dialogue.