Not Judging is not Christian!

[I]f thy brother shall offend against thee, go, and rebuke him between thee and him alone. If he shall hear thee, thou shalt gain thy brother. And if he will not hear thee, take with thee one or two more: that in the mouth of two or three witnesses every word may stand. And if he will not hear them: tell the church. And if he will not hear the church, let him be to thee as the heathen and publican. Amen I say to you, whatsoever you shall bind upon earth, shall be bound also in heaven; and whatsoever you shall loose upon earth, shall be loosed also in heaven. Matthew 18:15-18

...[T]hou, O son of man, I have made thee a watchman to the house of Israel: therefore thou shalt hear the word from my mouth, and shalt tell it them from me. When I say to the wicked: O wicked man, thou shalt surely die: if thou dost not speak to warn the wicked man from his way: that wicked man shall die in his iniquity, but I will require his blood at thy hand. But if thou tell the wicked man, that he may be converted from his ways, and he be not converted from his way: he shall die in his iniquity: but thou hast delivered thy soul. Ezekiel 33:7-9

Reprove a friend, lest he may not have understood, and say: I did it not: or if he did it, that he may do it no more. Reprove thy neighbour, for it may be he hath not said it: and if he hath said it, that he may not say it again. Admonish thy friend: for there is often a fault committed. Sirach 19:13-15

Thou shalt not hate thy brother in thy heart, but reprove him openly, lest thou incur sin through him. Leviticus 19:17

Open rebuke is better than hidden love. Better are the wounds of a friend, than the deceitful kisses of an enemy. Proverbs 27:5-6