Leviticus 4:13 And if the whole congregation of Israel sin through ignorance, and the thing be hid from the eyes of the assembly, and they have done somewhat against any of the commandments of the Lord concerning things which should not be done, and are guilty;

Perhaps one of the reasons many Christians do not read the Old Testament is because much of it is about the law and we are now under grace. Fine but does the nature of man and community change altogether just because we try and live under grace? Some of those OT lessons still apply from a standpoint of human tendencies.

Just because everyone agrees does not mean that we are right. I’ve seen whole conventions of religions choose to use their influence to isolate a segment of sinners and drive them further away from grace. Love the sinner but hate the sin wasn’t even mentioned. Condemnation of a sin and all who practice the sin does not touch the heart of a sinner and draw them out and away unto God.

The OT prophets often stood alone against overwhelming odds, but God prevailed. While the office of prophet no longer exists, if you see your fellow Christians agreeing and in your heart something isn’t quite right, speak up. You can say “I’m not convinced.” Open a dialogue.

Acts 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,

Living under grace does not mean you stop reasoning.