The best way to stand up for what you believe is to live what you believe privately as well as publicly. Always treat others with love because anger, forcefulness, criticism, and judgement only alienate others from what you stand for and believe. Love bridges many gaps. Tolerance forges many unions.
However, blatant wrong doing must not be sanctioned or overlooked. One must, at least, stand up against blatant misconduct. Then, whatever others decide to continue practicing is on them. You stand up and then separate yourself from wrong doing at that point. My protection is around you as you desire to follow My Ways in obedience.
I know that man can never live perfectly in My Will, but the desire of your heart is where you will be judged most severely. For, FROM YOUR DESIRES COMES YOUR ACTIONS. No one can fool Me, the Creator of life.
The best way to stand up for what you believe is to live what you believe privately as well as publicly.