“We need to remember that tolerance is not a Christian virtue. Charity, justice, mercy, prudence, honesty — these are Christian virtues. And obviously, in a diverse community, tolerance is an important working principle. But it’s never an end itself. In fact, tolerating grave evil within a society is itself a form of serious evil. Likewise, democratic pluralism does not mean that Catholics should be quiet in public about serious moral issues because of some misguided sense of good manners. A healthy democracy requires vigorous moral debate to survive. Real pluralism demands that people of strong beliefs will advance their convictions in the public square — peacefully, legally and respectfully, but energetically and without embarrassment. Anything less is bad citizenship and a form of theft from the public conversation.”
– Archbishop Charles Chaput
What the Archbishop says about (Roman) Catholics applies to all other Christians, as well.