Although there was one lone Ethiopian who became a Christian, in Acts 10:1-48 a whole house full of non-Jews heard the gospel, believed it, and was baptized. Their conversion was a big surprise to the first Christians, all of whom were Jewish. Yes, God loved those people too.
The personal letter Paul wrote to Philemon contains a beautiful picture of redemption through the work of Christ.
Jesus fulfilled the entire Old Testament by suffering, rising from the dead, and having forgiveness preached to all the nations.
Christian thinking is thinking like Jesus, especially as seen in his becoming one of us to die on the cross.