your own,
the websters defintion.
Main Entry: re·li·gion
Pronunciation: \ri-?li-j?n\
Function: noun
Etymology: Middle English religioun, from Anglo-French religiun, Latin religion-, religio supernatural constraint, sanction, religious practice, perhaps from religare to restrain, tie back — more at rely
Date: 13th century
1 a : the state of a religious <a nun in her 20th year of religion> b (1) : the service and worship of God or the supernatural (2) : commitment or devotion to religious faith or observance
2 : a PERSONAL SET or institutionalized system of religious attitudes, beliefs, and practices
3 archaic : scrupulous conformity : conscientiousness
4 : a cause, principle, or system of beliefs held to with ardor and faith
— re·li·gion·less adjective
you make up your own by taking what you like from on or another. that is selected what you dont like, and claim is untestable, thus you assume false.
so you are stating what truth is to you and discriminating accordingly. you have to, if not what would ensue is chaos. it has to be defined, to which i said earlier.