Jesus, John the Baptist, and the apostles went about proclaiming the kingdom–not the church (read Matthew 3:2, 4:17, 10:7; Acts 28:30-31). Although the church is in the kingdom, it is not the entire kingdom.
“Kingdom” denotes the rule of God over the whole cosmos, not just a single entity on the earth, like the church. In spite of this, most preaching today has as its goal to get people to make a weekly two-hour commitment to come to a building on Sundays and to give tithes to support that building! This is because a spirit of religion has captivated the church and blinded the minds of church leaders, so that we now have a very limiting church mindset instead of a kingdom perspective. The negative results of this cannot be overstated.