About the judging, one has to take into consideration the whole of the Bible, not just Matthew 7: 1-2.
John 7
24 Judge not according to the appearance, but judge righteous judgment.
Galatians 1
7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
9 As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed.