Finally, the church has an eschatological significance. To enter into the house of God, we must cross a threshold, which symbolizes passing from the world wounded by sin to the world of the new Life to which all men are called. The visible church is a symbol of the Father's house toward which the People of God is journeying and where the Father "will wipe every tear from their eyes." Also for this reason, the Church is the house of all God's children, open and welcoming.
Source: Catechism of the Catholic Church (Vatican.va)