You need to read your BIBLE!
If you must BLAME someone, blame Paul:
1 Corinthians 16:1-2
Now about the collection for God’s people: Do what I told the Galatian churches to do. On the first day of every week, each one of you should set aside a sum of money in keeping with his income, saving it up, so that when I come no collections will have to be made.
Paul met with believers in Troas to worship and celebrate communion and they gathered on the FIRST day of the week, SUNDAY!
Acts 20:7
On the first day of the week we came together to break bread. Paul spoke to the people and, because he intended to leave the next day, kept on talking until midnight.
So the apostles had no problem with SUNDAY worship and neither do I!
Of course worshipping God on any day of the week is OK, but the Sabbath is set aside. The Sabbath is properly sundown Friday to sundown Saturday. It is impossible to argue with facts, but go ahead and argue your opinion.