Means Higher Power, not a religion. Your own conception of a higher power, unrelated to a church, or the bible, priest etc or organized religious organizations. There are well over 500 organizations that follow exactly the original 12 step program. Some of the few off the top of my head are.
NA, CA, Nicotine Anonymous, Debtors, Sex, Gambling, Alanon, Alateen, Co-Dependancy, Enablers, Over Eaters, Bulemia.
So you got internet, type in in the search field. Takes 2 seconds. Define Secular.
sec·u·lar
/ˈsekyələr/
adjective
adjective: secular
1.
denoting attitudes, activities, or other things that have no religious or spiritual basis.
"secular buildings"
synonyms:
nonreligious, areligious, lay, temporal, worldly, earthly, profane; More
formallaic
"secular music"
antonyms:
holy, religious
2.
Christian Church
(of clergy) not subject to or bound by religious rule; not belonging to or living in a monastic or other order.
3.
Astronomy
of or denoting slow changes in the motion of the sun or planets.
4.
Economics
(of a fluctuation or trend) occurring or persisting over an indefinitely long period.
"there is evidence that the slump is not cyclical but secular"
5.
occurring once every century or similarly long period (used esp. in reference to celebratory games in ancient Rome).
noun
noun: secular; plural noun: seculars
1.
a secular priest.