(Also fits in RSTDT)
Obviously God made different races for a reason so why would He want one race to be the same as another? Yes, Adam was created in the likeness of God....the rest of us are all in the similtude of Adam. He made each race different and in order for that race to remain the way He created it then each race needs to stay within themselves.
I don't know about your church, but our church has all kinds of people - whites, blacks, hispanics.....American, Indian, Romanian, Polish, African, Guyanese, etc, etc...... We all go to the same church. We all sing praises to God together. We all hear preaching together. If THAT is not racial harmony then what is? When it comes to salvation we ARE all equal in the sight of God. ALL are sinners and must come to Him in repentance and faith.
As for the interracial dating - we have covered that somewhere here on the Board before - and it is wrong biblically. Please do a search to find that topic.