Sounds to me like you've been taught to believe that Christianity is a lie.
I believe in the Bible version of Christianity, not the man-made version that has no scripture to support Sunday as a day of worship.
These are facts of the bible:
1.God deemed the Seventh day as His holy day Exodus 20:10, Isaiah 58:13, Genesis 2:1-3
3. God commanded us to also keep holy the same day that is holy to God. Exodus 20:8, Ezekiel 20:12, Ezekiel 20:20 Makes sense to worship God on the same day is the holy day of the Lord thy God.
4. God only blessed and sanctified one day in the entire bible and that is His holy day, the seventh day Genesis 2:1-2, Exodus 20:11
5. God told us the first day is a working day, so it can't be holy if God told us to do our work and labor on the first day. Exodus 20:9
6. Jesus kept the Sabbath and went into the Temples on the Sabbath day as our example reading from scripture the Word of God. Luke 4:16-17
7. The disciples also kept the seventh day Sabbath preaching God's Word to everyone as our example Acts 13:42, Acts 13:44, Acts 17:2, Acts 18:4
8. Jesus referred to the Sabbath after He went to Heaven so if there was a change to His Fathers commandments, no one let Jesus know and it did not come from Jesus or God or the disciples. Matthew 24:20
9. Jesus told the disciples after He leaves Matthew 28:20
teaching them to observe all things that I have commanded you; and lo, I am with you always,
even to the end of the age.” Amen. Jesus did not instruct His disciples anything about Sunday keeping. Jesus taught in the Temples on the Sabbath as did the disciples. He told to continue with the same things He has commanded, not new things as know since there are no references to a new holy day of the Lord thy God.
10. We will continue on the New Earth and New Heaven worshipping the Lord on His day the Sabbath for eternity Isaiah 66:23 We do not have a God of confusion who flip flops the day of worship. God promises that He changes not. Malachi 3:6. God promised the Sabbath would stand forever Exodus 31:16 and we see fulfilled Isaiah 66:23
Your argument seems to be with scripture.