In verses 14-18 Paul compares the Jews with the Gentiles. Both of these nations are completely different. Paul describes these two groups as alienated, complete strangers. Not only were they strangers to one another, but they were strangers to gospel.
But Christ!
Both the Jews and the Gentiles were brought near to God through the blood of Christ which in turn, united them as one group, the church.
God creates each person with a unique personality, gift, and purpose that when combined make up a very diverse family. Through the grace and forgiveness we are given through Jesus Christ, we now bear God's name no matter what you have done or where you have come from. His grace brings completely different people together all to glorify Him.
In a jigsaw puzzle, each piece is completely different, but when you put them all together they create a beautiful picture. God uses our differences to bring glory, honor, and praise to his name.
God has given you a specific gift and talent. Whether that's dance, football, writing, speaking, singing, teaching, etc. he has given it to you. How can you use it to bring many other people to Christ?
-Bernadette Cabrera