Why is Christ Building His Church?

Are the firstfruits in the Church of God just an "early crop" of those in God's salvation plan? How does the Church fulfill God's purpose? Christ stated boldly He would build His Church. But WHY? The Father calls and invites into Church into the Church of God that Christ Founded for a reason. God has an incredible and wonderful purpose for the Church that most do not comprehend. It's essential to examine this question of what is the purpose of the Church of God, as the answer holds significant importance for every member of the Church of GOD