No good can come from calling fellow believers enemies. These are people we fellowship with at the table of the Lord, meet with in corporate worship, lay our burdens down together before the throne. To determine that they are enemies when God Himself has declared them His friends at the expense of the blood of His Son is to pronounce that relationships operate on your rules and terms, regardless of what God has done. And because it’s possible that those you suspect are behaving badly are not believers, it’s still not grounds for alienation if all they’ve done is give the appearances of enmity. They are without the spiritual tools needed to do conflict well. Witness to them of the greatest work of reconciliation done in all of history and rightly inform them they are enemies to God—as you once were—and that they can be bought and washed and made new—as you are now.