Or they are in complete violation of Paul's counsel at 2 Corinthians 6:14-18...
"...what do righteousness and lawlessness share together, or what does light have in common with darkness? 15 Or what harmony does Christ have with Belial, [the devil] or what does a believer share with an unbeliever? 16 Or what agreement does the temple of God have with idols? For we are the temple of the living God; just as God said,
“I will dwell among them and walk among them;
And I will be their God, and they shall be My people.
17 Therefore, come out from their midst and be separate,” says the Lord.
“And do not touch what is unclean;
And I will welcome you.
18 And I will be a father to you,
And you shall be sons and daughters to Me,”
Says the Lord Almighty."
We are not to "touch" what is spiritually "unclean" in God's eyes. He tells us to separate ourselves from those things if we want to be his "sons and daughters".
It all comes down to our assumptions. For example the post I'm quoting (your post) assumes Belial to be a being. I don't and think it refers to an idolatrous cult which begins in the tribe called 'Dan'. Can I demonstrate this, no; but I sure don't think of it as a being. I notice the scripture has opposites: belial is the opposite of Christ just as the temple of God is the opposite of idols, just as lawlessness is the opposite of upright, just as light is opposite of darkness. It proposes we can be made sons of God, which is synonymous with sons of Abraham, with peacemakers, with those who hunger and thirst for righteousness. Sons of Abraham are the opposite of Sons of Cain, the murderer. They have left Cain for Abraham. They have cut off that part of themselves.
[Mat 5:9 NIV] 9 Blessed are the peacemakers, for they will be called children of God.
[Jas 3:18 NIV] 18 Peacemakers who sow in peace reap a harvest of righteousness.
How can a person have the Lord Almighty as a father? Do I not already have a male parent? This suggests I leave one parent to be adopted by another, but what was unclean to Moses is clean for me. How then can the Lord Almighty be my father if some unclean things have been made clean for me? This is the mystery of Christ. So I may eat, and I may taste and touch. What, then, is unclean? Easter? No, that is no more unclean than a bowl of bacon for me. Jesus says its not what goes into us that makes us unclean but what comes out of our hearts, so to me its purification of the heart which matters. Easter will not hurt anyone or cause anyone to lay eggs.
[Mat 15:19 NIV] 19 For out of the heart come evil thoughts--murder, adultery, sexual immorality, theft, false testimony, slander.
[Act 10:28 NIV] 28 He said to them: "You are well aware that it is against our law for a Jew to associate with or visit a Gentile. But God has shown me that I should not call anyone impure or unclean.
[Rom 14:14 NIV] 14 I am convinced, being fully persuaded in the Lord Jesus, that nothing is unclean in itself. But if anyone regards something as unclean, then for that person it is unclean.
By what means has unclean been made clean? Obviously it is a different approach, because the covenant is supposed to be forever. All I can piece together (because I'm a terrible student) is that it has something to do with what
Zechariah says. He talks about holiness as something which spreads out making unclean things clean, instead of the opposite. Normally touching something unclean makes clean things unclean, like leprosy or finding something dead in the road.
[Zec 14:20-21 NIV] 20 On that day holy to the Lord will be inscribed on the bells of the horses, and the cooking pots in the LORD's house will be like the sacred bowls in front of the altar. 21 Every pot in Jerusalem and Judah will be holy to the LORD Almighty, and all who come to sacrifice will take some of the pots and cook in them. And on that day there will no longer be a Canaanite in the house of the LORD Almighty.
Also we have this example of the clean making something else clean:
[1Co 7:14 NIV] 14 For the unbelieving husband has been sanctified through his wife, and the unbelieving wife has been sanctified through her believing husband. Otherwise your children would be unclean, but as it is, they are holy.
How this all works would be somewhat baffling if I tried to figure it out logically from the law for myself. I haven't been able to do that. If however its a matter of the heart of and common sense then I can except it. I don't regard Easter as a problem.