You are not spiritual because you say "namaste" after a yoga session. First of all have to admit, I'm not a super spiritual person and didn't look very deep into the subject. The reason is pretty straight forward, I'm German, and I simply don't have the cultural predisposition. The main thing we do where I'm from is [over]rationalizing everything. Nonetheless, I understand that some people are intrigued by Asian culture and take a deep dive into it, but honestly, if you are an American or from Europe you'll never fully comprehend what asian scholars live out. You and I, we didn't grow up in a cultural environment like, for instance, India with spicy food, giant families, a caste system and hundreds of different gods, depicted in the most colorful and shrill way imaginable, which represent the elements of their only one real God, that gave birth to practices like yoga and meditation. So instead of searching for a blueprint for happiness and a concept you can cling to, just look for inspiration and accept that everlasting bliss is an illusion; it'll never be a consistent state of being. Secondly, you're better off creating your own culture with your own set of rules by basically cherry-picking certain elements of foreign cultures and integrating it in your life in consideration of your own cultural background and personal preferences. "When we look at the world rationally, the world looks rationally back." That's why I choose to explore spiritual literature. The material (rational) realm does not provide all the answers. Not at all.