The Church of God claims that Passover was abolished at the Council of Nicaea in AD325, but church history shows that it was not Passover that was abolished at the Council of Nicaea, but the issue of the Lord's Supper, which was celebrated at Passover.

Around AD70, the early church split into the Eastern (Asia Minor) Church, centered in Jerusalem, and the Western Church, centered in Rome. They celebrated the Lord's Supper according to the teachings of Jesus. According to church history, the Eastern (Asia Minor) Church celebrated the Lord's Supper after fasting from the evening of January 13 of the Jewish calendar until 3:00 p.m. on January 14 of the Jewish calendar, the day Jesus died, because they commemorated his death. The Western church, however, fasted from 3:00 p.m. on January 14, the day Jesus died, until the following Sunday, and then celebrated the Lord's Supper because they considered Jesus' resurrection more important than his death.

The reason the Eastern Church celebrated the Lord's Supper after 3:00 p.m. on January 14 of the Jewish calendar was to commemorate the death of Jesus. Because Jesus died as the Passover lamb, church history records that both the Eastern and Western churches prepared for the supper around 3:00 p.m. on January 14, the day Jesus died. The photo below is a church history record of Jesus' death on January 14 at 3:00 pm.

As a result, the Eastern and Western churches met several times from around 150 AD to agree on a date for the Lord's Supper, but were unable to reach a consensus, so they celebrated it in their own ways. Then, in AD325, the Council of Nicaea agreed with the Western church and decided to celebrate the Lord's Supper on Sunday. Therefore, it was the Lord's Supper, not Passover, that was discussed at the Council of Nicaea in AD325.

According to the Bible and church history, Jesus had his last supper with his disciples on the evening before Passover (January 13) and died on January 14 at 3 p.m. in the Jewish calendar. Following the command to fast on the day the bridegroom is taken away, the disciples fasted from the night of January 13, the day Jesus was arrested, until 3:00 p.m. on January 14, the day Jesus died, and then celebrated the Lord's Supper to commemorate his death. After Jesus died, the Jews celebrated their victory by enjoying a Passover, which is different from the Lord's Supper celebrated by the early church members.

CEV [John 19:31] The next day would be both a Sabbath and the Passover. It was a special day for the Jewish people, and they did not want the bodies to stay on the crosses during that day. So they asked Pilate to break the men's legs and take their bodies down

The Eastern Church, which followed the teachings of Jesus, celebrated the resurrection on the third day after the 14th day of the Jewish calendar, regardless of the day of the week. The Western Church, however, believed that Jesus rose on Sunday, so they celebrated the resurrection on the first Sunday after the 14th day. So the Eastern Church celebrated by remembering that Jesus rose on the third day, and the Western Church celebrated on Sunday regardless of the time, which is how the Church of God follows the Western Church today.