He said the law would not pass away until "all is accomplished". (Mat. 5:18) All was accomplished on the cross, thus Christ's last statment: "It is finished". (Jn 19:30)
They don’t understand that the early church met in peoples homes. The Apostles were sent out to preach, not to build soaring edifices. They were supported with food, clothing and lodging. The early church supported one another and helped outside their group when they found a need. Jesus told the 12 to “Feed my sheep”. There was nothing about building churches and tithing. The “church” isn’t a building but the people.