The Church of God also keeps the Sabbath and keeps the 7 feasts in three times including the Passover according to God's will.

There are people who ask "Isn't it keeping the Old Testament law?".
It's not like that.

The Sabbath, Passover, and all feasts kept by the Church of God are not the Old Testament law, but the New Covenant Christ’s law.

Hebrews 8:7-13
For if there had been nothing wrong with that first covenant, no place would have been sought for another.
But God found fault with the people and said: "The time is coming, declares the Lord, when I will make a new covenant with the house of Israel and with the house of Judah....
By calling this covenant "new," he has made the first one obsolete; and what is obsolete and aging will soon disappear.

Here, the first covenant is the law of Moses and the new covenant is the law of Christ.

It is said that the second covenant, the new covenant, was established because the first covenant had fault.

Because we cannot receive complete salvation through the faulted law of Moses.

That is why Jesus established the new covenant, the perfect law, the law of Christ, so that we can receive complete salvation.
That is why, after the New Testament age, there is no need to keep the Old Testament law, we just have to keep the New Covenant law.

Matthew 5:17
Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.

According to these words, Jesus established the perfect law, the law of Christ.
Therefore, we must keep the law, but not all the laws of the Old Testament, but the complete law of Christ.

Let's keep the law of the new covenant together in the church of God.

Let's receive Christ Ahnsahnghong together in the Church of God and receive the blessing of salvation.