Sunday worship, a Different Gospel

Numerous churches in the world today worship God every Sunday.

Then, Do you think Sunday worship is part of the gospel of Christ?
Let' find the answer in the Bible

Matthew 28/18-20 Then Jesus came to them and said "... Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you"

What did Jesus ask us to teach to all nations? Everything Jesus Himself taught and commanded us. It is Gospel of Christ.
The gospel of Christ also includes the examples Jesus personally set.

John 13/15-17 I have set you an example that you should do as i have done for you.... nor is a messenger greater than the one who sent him. Now that you know these things, you will be blessed if you do them."

Apostles followed the example of Christ.

1 Corinthians 11/1 Follow my example, as I follow the example of Christ.
Then, had Jesus ever kept Sunday or taught people to keep it? NEVER!!!

Jesus only kept the Sabbath as was His custom.

The apostles, too, who followed the example of Jesus, kept the Sabbath every week as their custom was.
Sunday Worship is not the gospel of Christ.

Then,what will happen to those who keep Sunday and also teach other people to worship on Sunday, although it is not the Gospel of Christ?

Galatians 1/6-9 I am astonished that you are so quickly deserting the one who called you by the grace of Christ and are turning to a different gospel- which is really no gospel at all. Evidently some people are throwing you into confusion and are trying to pervert the gospel of Christ. But even if we or an angel from heaven should preach a Gospel other than the one we preached you, let him be eternally commanded! As we have already said, so now I say again: If anybody is preaching to you a Gospel other than what you accepted, let him be eternally condemned!

Therefore, we must forsake Sunday(a different gospel) and follow the example of Jesus and keep the Sabbath(the gospel of Christ), making it our custom.