Scripture is very clear on those issues, to those who are willing to read God's Word as it is. As for the ethnic, political, racial, regional, etc. The fact that these matters aren't resolved by those attempting to do so is proof positive that these same people are NOT In Christ. If barriers exist, it is not Christ's Church. Salt flavors food.
Salt also stings greatly when it enters a wound.
But when it does so, it cures. Most today don't want doctrine. In so doing, they are rejecting God's Word, as well as God Himself Who inspired it. If not, God's gracious mercy extends to you.