Romans 15: 7
Wherefore, accept one another, just as Christ also accepted us to the glory of God.
God has not called us to be separatists but rather to love one another in the unity of His great love for us all. Nor did he call us to be judges, neither of the brethren nor of the world. This is a great temptation for us all. We know the way he has called us to righteousness. We have seen in his word behaviors he has told us to stay away from so it is easy for us to say that those things are wrong and judge people who participate in them. Sometimes we go even further. We judge those who are different from us or practice their faith in a different way. We need to remind ourselves that we are called into unity with one another (Ephesians 4: 3) and that Jesus gave us only one commandment (John 13: 34). That is that we love one another as he loved us. His love was sacrificial; putting our needs before his own. When we can get that one commandment down we will not have to worry about judging others. We will receive them in love. We will accept everyone even as Christ accepted us.