Here is a list.
civil earthly laic lay layperson material mundane profane temporal worldly materialistic nonreligious
I believe that the best term would be nonreligious. This being said it would also depend on the context of what the way you want to replace it.
Latin
worldly
Non-religious.
Non-religious or worldly.
unblessed, secular
what is the best synonym for autocrat
The best synonym for emit is release.
Best synonym for bossy is KING.
The best synonym for vacuous is 'intelligent'
Sprout is a good synonym.
Synonym for respite: rest
Planned economy- is the best synonym
A synonym is another way of phrasing something. A synonym for "to the best of your knowledge" would be "as far as you can tell".
Very simple:Quintessential