There are many people who go to church, but they are not doing what Jesus taught 2000 years ago. When did Jesus keep Sunday worship as a holy day, was born on Christmas Day, and told us to put up the cross in the church? Jesus eagerly wanted to observe the Passover, keeping the Sabbath worship on Saturday according to his own custom. He also taught us not to worship idols and to serve only God. The only church that does this perfectly is the Church of God. Therefore, the Gospel can only come from the Church of God.

Sunday worship is not the gospel of Christ.
Jesus did not teach us to observe Sunday services.
He only commanded us to observe the Sabbath.
We must be God's blessed children by doing the Sabbath according to the teachings of Christ.

The gospel which Jesus taught and showed us is the New Covenant. Jesus's disciples and the Early Church kept the New Covenant and preach the gospel by following the teachings of Jesus, the New Covenant. We must follow the way of Jesus and his disciples by preaching the New Covenant for the glory of the kingdom of heaven.

Gospel means good news. For the sinners who are destined to die, the good news is the forgiveness of their sins and eternal life. In the bible, the Passover has the promise of God of forgiveness and eternal life. Therefore, the core of the gospel is the Passover. The gospel without the Passover is the false gospel or another gospel, which is not gospel at all.