According to Wikipedia, "Religion is usually defined as a social-cultural system of designated behaviors and practices, morals, beliefs, worldviews, texts, sanctified places, prophecies, ethics, or organizations, that generally relates humanity to supernatural, transcendental, and spiritual elements; however, there is no scholarly consensus over what precisely constitutes a religion."
Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university, including professional training and informal learning.
There are lots of self-learning contents about religions, which you can study by yourself before going into a formal education.
Category:Religions - Wikiversity (this category is not finished yet)
There are some interesting topics that you may have a look: