Why are the Mythology and Religion sections separate?

[Politically Incorrect]

According to the dictionary, a myth is

1. a traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, esp. one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature.
2. stories or matter of this kind: realm of myth.
3. any invented story, idea, or concept: His account of the event is pure myth.
4. an imaginary or fictitious thing or person.
5. an unproved or false collective belief that is used to justify a social institution.

While religion is

1. a set of beliefs concerning the cause, nature, and purpose of the universe, esp. when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.

So tell me what makes the two different? Neither have been proven to be true, they both attempt to
explain the natural world. Did the Romans, Greeks, or any other group that has, does, or will exist believe anyless fervently than you. Or were they just wrong?

To me, I can't tell the difference between the bible and a book on Greek "myths." Are not they both a collection of stories intended to instruct or guide?
I realise this has been asked before. I also realise that Gays have more than once asked for fair treatment. Is this cause any less worthy? Both attempt to bring about the right state of being without the the restraints of cultural tradition.
I don't mean to target the Homosexual movement specifically. It is just an example. You can mentally copy and paste the Civil Rights movement, or Women's Suffrage if you want.
Then why not call the Mythology section, the Stories and Other Literary Aspects of Religion section ( SOLAR if you want) and the Religion and Spirituality section the the Theory and Practice or Religion.