I win!Godwin's law time.
But notice that the OP actually required that Hitler be supplied as a counter-example to the OP's claim.
What you say runs counter to libertarianism.I'm a libertarian because I say I am no matter what I espouse and no matter what I do and no matter what the moral standards I violate. So when I confiscate all your worldly possessions you must call me a libertarian because my actions which prove the opposite don't count.
Although....there are those deluded folk who ocymoronically call themselves "libertarian socialists".
Being good, & avoiding evil are best achieved by being good & avoiding evil.WWII and the Cold War was a climactic struggle between good and evil with the entire world involved. Tel Megiddo writ large. And we're all here today because of the action of one Soviet sub commander who prevented WWIII.
It was not a matter of secularism but of a deeper current of life.
Whatever religious beliefs comport with this are OK with me.