When one encounters someone accusing the brethren then we know who is behind the accusing. The Bible advises through James 4:7 to submit ourselves to God . Resist the devil , and he will flee from you.
True believers will encourage fellow believers in the Lord. Why will there be someone who will continue to put down believers is beyond me .
The God of the Bible, the God of Abraham, Isaac and Jacob is a God of love as revealed by Jesus Christ and the Holy Spirit. God is long suffering not wanting that any should perish and that all will come to repentance. Punishment is reserved only to those who will not repent.
Our hearts should be hearts of compassion, intercession, love and not condemnation. We should be calling men to repent and come to God and not condemnation.