Truth

Premise
Jesus Christ has warned us to recognize false prophets.
Matthew 7:15

“Watch out for false prophets. They come to you in sheep’s clothing, but inwardly they are ferocious wolves.”

Theme
Matthew 23:13

“Woe to you, teachers of the law and Pharisees, you hypocrites! You shut the kingdom of heaven in men’s faces. You yourselves do not enter, nor you will let those enter who are trying to.”

Teachers of the law and Pharisees in Jesus’ times were hypocrites, false prophets. Then, how can we distinguish false prophets from true prophets?
Matthew 15:7

“You hypocrites ! Isaiah was right when he prophesied about you:’ These people honor me with their lips, but their hearts are far from me. They worship me in vain; their teachings are but rules taught by men.’”

Hypocrites worship God in vain, for they worship in accordance with men’s commandments, man-made stipulations. (Men’s commandments are commemorating Sunday, Christmas, Crucifix, Thanksgiving, etc, which were not told to be commemorated in the Holy Bible).
For such false prophets, the Prophet Ezekiel, Jesus Christ and apostles explained as follows:
Ezekiel 22:23-25

“There is a conspiracy of her princes within her like a roaring lion tearing its prey; they devour people, take treasures and precious things and make many widows within her.”

Hypocrites have been plotting to devour human souls as lions do.
I Peter 5:8

“Be self-controlled and alert. Your enemy the devil prowls around like a roaring lion looking for someone to devour.”

Hypocrites who are practicing man-made stipulations are devils - “roaring ferocious lions” They are always prowling around to devour souls of God’s people. Their noticeable particulars are as below:
Ezekiel 22:26

“Her priests do violence to my law and profane my holy things: they do not distinguish between the holy and the common; they teach that there is no difference between the unclean and the clean; and they shut their eyes to the keeping of my Sabbaths, so that I am profaned among them (i.e., among false prophets).”

False prophets have been declining God’s Sabbath day; that means, God has been being profaned among them. Surely, they have not been keeping the Sabbath day. Those who have not been keeping the Sabbath day are:
Ezekiel 22:27

“Her officials within her are like wolves tearing their prey; they shed blood and kill people t make unjust gain.”

Matthew 7;15

“Watch out for false prophets. They come to you in sheep’s clothing, but inwardly they are ferocious wolves.”

False prophets appear to perform God’s tasks, but they do not keep the Sabbath day; ‘they come to you in sheep’s clothing, but inwardly they are ferocious wolves’.
We should be convinced that one who does not keep the Sabbath day dare to say that he or she is performing God’s task is a false prophet who intends to devour his/her young lambs. Outwardly well- dressed. they really are:
Ezekiel 22:28

“Her prophets white-wash these deeds by false visions and lying divinations. They say, ‘This is what the Sovereign Lord says’ - when the Lord has not spoken.”

Matthew 23:27

“Woe to you, teachers of the law and Pharisees, you hypocrites! You are like whitewashed tombs, which look beautiful on the outside but on the inside are full of dead men’s bones and everything unclean.”

Those who commemorate Sunday-man-made stipulations - are like whitewashed tombs. God prophesied that they would be destroyed at the End.
Ezekiel 22:31

“So I will pour out my wrath on them and consume them with my fiery anger, bringing down on their own heads all they have done, declares the Sovereign Lord.”

That means, God prophesied the destruction of those who do not keep His Sabbath Day.

Conclusion
Worshiping Sunday is not God’s will because it is a man-made stipulation. Therefore, those who commemorate Sunday cannot enter the Kingdom of Heaven. God told us with His prophesy that prophets in churches obeyed man-made stipulations like commemorating Sunday are surely false prophets. Any person who obeys false prophets’ words will only be destroyed, which is God’s intention. Such persons do not obey God’s commandments but create and obey their evil laws. Jesus Christ warned us to watch out false prophets.