It's OK to judge

Yes it's true. It's OK to judge those who proclaim to be believers in Christ. It's actually Biblical (1 Corinthians 5:12-13).
Most of the time you hear people saying, "don't judge! It's up to God! It's a sin!" but you have to think of it in context. Yes, God will and does judge all people, and yes, we as humans are not to judge nonbelievers at all. My mother once advised me, "Danielle, you cant expect nonChristians to act like Christians." No, we are not to judge believers in a demeaning manor. We are to judge them in a form of godliness to match them with His standards of who we are to be. To build up the faith. To encourage and assist those who are our brothers and sisters.To make His Name great.

If I am unknowingly mistaken or you have any advice, please comment :]