This is not true, these people have the idea that Sunday is a day to go to church and not that it is the biblical Saturday. Because there is no basis for it. Many of them just accepted this because that was what their companions did, and not because it came from God's order and instructions. The Seventh day has basis and authority in the word of God, Sunday does not. The Sabbath has instructions on how to observe it correctly, Sunday does not. It is associated with several events in the Bible such as the creation and redemption of the people being made and declared by God himself, not Sunday. Jesus kept this day and taught him the right way to observe it, not Sunday. God wrote it on stone tablets with his finger, not Sunday.
I don't know which God you believe in, but the genuine Christian is based on the God of the word and Jesus said it is the truth:
John 17:17: "Sanctify them through thy truth: thy word is truth."
Ps 119:9,11: "Wherewithal shall a young man cleanse his way? by taking heed thereto according to thy word. … Thy word have I hid in mine heart, that I might not sin against thee."
Because there is no Christian, no Christianity without the Bible because Jesus as God is taught and testified only in It. Do you know how Jesus refuted all of Satan's deceptions and temptations?, quoting only the Word:
Mat 4:3-4: "And when the tempter came to him, he said, If thou be the Son of God, command that these stones be made bread. But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceeds out of the mouth of God."
That's why I quote the word so much, because She is the truth, She has the power to instruct, convert, rebuke, advise, discipline, bless, welcome, reveal the desires of the heart but human opinion does not have that power. Do you and others here think that the Bible is the most produced and read book in the world? No, she actually has the power of God. You can give any book in the world to prisoners, but none will have the same power over them as the Bible. All this and many more is just testimony to the fact that it is the truth.
Using the appeal to the majority is a bad argument, because it was the majority of Jews who rejected Jesus, it was a majority who rejected Noah's preaching. And a large majority will be lost:
Mat 7:13-14: "Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: Because strait is the gate, and narrow is the way, which leadseth unto life, and few there be that find it."
I have the Bible, the Word of God to affirm the truth, who do you have? Roma? Constantine? People who perform certain rites without questioning their origin? None of this or anything you want has more authority than the sacred scriptures, which, as Jesus said, are the truth. But once I tell you, based on what Jesus said, people would not be lost because they did not know the truth, but rather because they chose to reject it, because their works were evil. Which side are you on?
Biblically, faith is based on an experience and relationship with God, whether through the most varied forms. It is not something blind and irrational. In the Bible, and today, people know why they are following Jesus it is based on something, it is not blind trust. You said that faith can take a person to a bad place, but God says otherwise:
Heb 11:6: "But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him."
The spirit of the antichrist is to put himself in God's place, that's what you are doing and that is what the Roman power in the middle ages did by changing the day of worship established by God.
Tell us your story, what you were and did and what made you change your mind. Why are you angry with God?