secular Frummy:
believer may break it out of desire and a non believer to fit in both are understandable
As explained to me by someone who is familiar with this subject Orthopraxy means a person who practices orthodox Judaism (that includes both in public and private). However they do not believe in it.
I personally don’t know of any such people. (unless it is just a temporary step to going off the derech and they are still scared to break halacha. But after slowly doing more aveiros that sense of wrongdoing can go away.) So I don’t see why someone who really doesn’t believe wont even break halacha in practice (ie not orthopraxy)
“Orthopraxy is a term derived from modern Greek ?????????? (orthopraxia) meaning “correct action/activity” or an emphasis on conduct, both ethical and liturgical, as opposed to faith or grace etc.[1][2][3] This contrasts with orthodoxy, which emphasizes correct belief, and ritualism, the use of rituals.[“
-wikipedia
now if by orthopraxy you mean someone who keeps halacha in public but really doesn’t keep shabbos for example then he isn’t even practicing orthodoxy (ie orthopraxy)