Anyone who feels that there is something above oneself is a religious person.
Religion is the consciousness of there being something above and beyond oneself.
That is all. If you feel that you are complete, and there is nothing beyond or above you, there is no need for religion. This is a simple psychological definition. The consciousness that there is something above, beyond you, more than you, larger than you, transcending you, which you would like to reach, is religion. You may call it religious consciousness, if you like.