If - Colossians 1:23

Colossians 1:23 ESV 

if indeed you continue in the faith, stable and steadfast, not shifting from the hope of the gospel that you heard, which has been proclaimed in all creation under heaven, and of which I, Paul, became a minister.

Paul says we are reconciled if...

If we remain or continue in the faith. This is the way. Christ will get us there and we have been shown the way, but we must want to go. 

We have heard the gospel and the word has gone out into all creation. Christ seeks a bride and the bride must come of her own free will. The bride, the body of Christ, is gathering and we await the coming of the bridegroom. 

The bride will not include everyone who will be brought into the kingdom of God. The bride is gathered up before the great tribulation. Out of that tribulation will come a multitude without number who will worship God and sing His praises. Every knee shall bow and every tongue will confess that Christ is Lord.