To affirm the church is to affirm the gospel of Jesus Christ, for without that gospel there would be no good news, no message of salvation, no redemption of sinners, and thus no redeemed people of God.
I was recently looking at a book of commencement speeches. They were mostly unremarkable, but the general tone was that college graduates were told to seize the day and believe in themselves. Where does that get you?
God’ sovereign plan from the beginning was to fill the earth with human creatures — image bearers who would obey him by multiplying and by following the creation mandate in order to reflect the creator’s glory.