It's not loving to condone sin

The strength and speed of this mistake can be seen in the history of the Christian churches. Already in its first 100 years, the problem of Christian churches believing falsely that it was good to condone sin had to be addressed repeatedly:

(1) Christ Jesus teaches clearly that sin cannot be condoned: 

"Yet whoever would cause one of these little ones who believe in me to stumble, it is better for him that a heavy millstone be hung around his neck, and he be sunk in the depth of the ocean. Woe to the world because of stumbling blocks! For a necessity is the coming of stumbling blocks, but woe to the person through whom the stumbling block comes! Then, if your hand or your foot causes you to stumble, cut it off and cast it from you. Better it is for you to enter into life lame or maimed, than two hands or two feet having  to be cast into the eternal fire. And if your eye causes you to stumble, pluck it out and cast it from you. Better it is for you one-eyed to enter into life, than  two eyes having, to be cast into the hell of the fire. See that you do not despise one of these little ones, for I say to you that their angels in heavens through all see the face of my Father in heavens. What is worthy to you? If there be for a person one hundred sheep, and one of them is led astray, does he not leave the ninety-nine on the mountains and go to seek the one going astray? And if he come to find it, amen, I say to you that he rejoices over it more than over the ninety-nine not having gone astray. In this way, a desire is not before your Father in heavens that one of these little ones should perish. Then, if your brother sins against you, go, reprove him between you and him alone. If he hears you, you have gained your brother. But if he will not hear, take with you one or two more, so that ‘upon a mouth of two witnesses or three every word be established.’ But if he is unhearing toward them, tell the church. But if he is unhearing even toward the church, he must be to you like a heathen and a tax collector." (Matthew 18:6-17, CFB)

(2) Christ Jesus confirms that there are severe divine consequences for unrepented sins of such gravity (e.g. fornication):

"But I have a few things against you, because you have there those who hold the doctrine of Balaam, who taught Balak to put a stumbling block before the children of Israel, to eat things sacrificed to idols, and to commit sexual immorality. Thus you also have those who hold the doctrine of the Nicolaitans, which thing I hate. Repent, or else I will come to you quickly and will fight against them with the sword of My mouth." (Revelation 2:14-16, NKJV)

"Nevertheless I have a few things against you, because you allow that woman Jezebel, who calls herself a prophetess, to teach and seduce My servants to commit sexual immorality and eat things sacrificed to idols. And I gave her time to repent of her sexual immorality, and she did not repent. Indeed I will cast her into a sickbed, and those who commit adultery with her into great tribulation, unless they repent of their deeds. I will kill her children with death, and all the churches shall know that I am He who searches the minds and hearts. And I will give to each one of you according to your works." (Revelation 2:20-23, NKJV)

John, Peter, Jude, James and Paul also addressed sin in the churches, repeatedly, with great urgency.

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Notes

CFB: Scripture quoted from the Christ Family Bible. Copyright © 2017 by J.J. Thomas. Used by permission. All rights reserved.

NKJV: Scripture taken from the New King James Version®. Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.