"Tolerance is a virtue - for those who have no convictions." G.K. Chesterton
To judge another religious group to be false can seem a pompous undertaking, especially in a culture that preaches tolerance for everything. Tolerance is the banner that unites much of our culture, and anyone who points a judging finger at someone or something is often ridiculed.
But Christians are told in the Bible to separate themselves from the sinful practices of man and to expose error. A distinction has to be made between Christians and those who label themselves as such who clearly are not. God’s word tells us to examine all things and hold fast to that which is true (1 Thessalonians ), so we do.
How can we then examine without judging what is right and wrong? Jesus judged the Pharisees as hypocrites. Peter judged Ananias and Sapphira as liars. (Acts 5:3,4) Paul judged the Galatians as fools (Galatians 3:1).
Something can be said to be right or wrong because the Bible has laid out before us a moral and doctrinal standard that is clear. It is wrong to lie, so we are able to say to someone who lies, “what you are doing is wrong.” That is making a judgment. Of course, a Christian already realizes they are sinners saved by grace (recognizes the log in their own eye first), and is therefore not perfect. But, that doesn’t mean that we should have an ‘anything goes’ attitude for fear of being seen as “judgmental” and ignore sin when we see it.
Christians are commanded to be able to give answers to everyone and to contend for the faith. If we do not fight for the faith, the faith will be lost. If we do not expose the errors of false "Christians" and cults, then the cults and false teachers will move unchecked in the world and lead even more people into eternal destruction.
To make a judgment means we must recognize that there are absolutes. In a world that worships relativism, absolutes are not welcome and the cults that espouse their demonic doctrines beg tolerance.
The true Church stands for the truth of God’s Word, not a compromising collection of beliefs that changes as people’s whims change. The false religions are false because they deny the true God, add works to salvation, and corrupt a multitude of biblical truths. Their end and the end of all who follow them is damnation. To do anything other than warn people about them would be unloving.