I think that would fall under false idols which would mean, yes. I think Ephesians 5:11-12 says it best:

Take no part in the unfruitful works of darkness, but instead expose them. For it is shameful even to speak of the things that they do in secret.

2 Kings 18:4 covers taking down false idols:

He removed the high places and broke the pillars and cut down the Asherah. And he broke in pieces the bronze serpent that Moses had made, for until those days the people of Israel had made offerings to it (it was called Nehushtan).

And of course Ephesians 6: 11-12 tells us exactly how to protect ourselves from the false idols and wickedness:

Put on the whole armor of God, that you may be able to stand against the schemes of the devil. For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.

Which is, in my estimation, battle on a spiritual level which is even more important than calling out false Christians in public.

And finally Deutoronmy 13: 6-8

“If your brother, the son of your mother, or your son or your daughter or the wife you embrace or your friend who is as your own soul entices you secretly, saying, ‘Let us go and serve other gods,’ which neither you nor your fathers have known, some of the gods of the peoples who are around you, whether near you or far off from you, from the one end of the earth to the other, you shall not yield to him or listen to him, nor shall your eye pity him, nor shall you spare him, nor shall you conceal him.

I think that would fall under false idols which would mean, yes. I think Ephesians 5:11-12 says it best:

Take no part in the unfruitful works of darkness, but instead expose them. For it is shameful even to speak of the things that they do in secret.

2 Kings 18:4 covers taking down false idols:

He removed the high places and broke the pillars and cut down the Asherah. And he broke in pieces the bronze serpent that Moses had made, for until those days the people of Israel had made offerings to it (it was called Nehushtan).

And of course Ephesians 6: 11-12 tells us exactly how to protect ourselves from the false idols and wickedness:

Put on the whole armor of God, that you may be able to stand against the schemes of the devil. For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.

Which is, in my estimation, battle on a spiritual level which is even more important than calling out false Christians in public.