I don't necessarily think this is the case. While there have certainly been times when my spirituality was centered around deities, both Christian and Pagan, there have been many more times when my focus would be simply on a higher plane of existence. Meditation and chakra work is highly spiritual, yet not particularly deity-focused. Connecting with animal or nature spirits is another situation that can be, but is not necessarily, deity-related. I believe there is a definite difference between being "spiritual" and being 'religious".