Love unconditionally just as Jesus loves us. If we don't love, TRULY LOVE, others no matter who they are, what they believe, or what they've done... We aren't following Christ. Make it clear where you stand, but don't condemn.
"Do not waste time bothering whether you 'love' your neighbor; act as if you did. As soon as we do this, we find one of the great secrets. When you are behaving as if you loved someone, you will presently come to love him." -C. S. Lewis