Paul knew that faith and knowledge are not mutually exclusive, but indeed, they are mutually beneficial. An examined faith, where doubts are addressed and facts considered, is better than a faith that is held blindly. Paul’s purpose for writing the new believers in the city of Colossae was to help them add a growing knowledge of Christ to the faith they had already expressed by trusting in Him.
He wrote to encourage them to grow in their knowledge of Christ as the supreme explanation for all things, so that their faith in Him might also increase. We can grow in our knowledge of Christ as the supreme explanation for all things, so that our faith is increased.