What should you do when someone teaches false Dharma? I was part of a religious group that claimed to be everything that the Buddha teaches. But, when you listen to their teachings, you can tell discrepancies between their teachings and Buddhist teachings.

I just saw many people being misguided, but I do not know what to do. (Just to clarify, the religious group I'm referring to is neither Mahayana nor Theravada. But, the question can be generalized further if necessary.)

On one end, I do not wish to create any conflict among anyone. 
On the other end, I feel sad that many people are misguided into the teaching. 

So, the question is: What should I do? 

Any answers based on experience would be AWESOME, and experience + Scripture references (said by famous teachers or based on Pali Canon) would be an Awesome+++infinity. :) Once again, I hope to find a method that does not create animosity. 

Thanks Buddhist Community! Praises to the Dharma.
******As for an explanation on how this question is different from the forum titled "How to address wrong view", it's pretty much the same, except this is more scenario-based. I just wanted a different perspective/insight to this specific scenario. My ultimate goal is to avoid conflict!!!
You can share with them DN 16's Four Great Referrals:

“Here, monks, a monk might speak like this: ‘I have heard this directly from the Gracious One, friends, directly I learned it: “This is the Teaching, this is the Discipline, this is the Teacher’s Dispensation.”’ That monk’s speech, monks, is not to be rejoiced over, not to be scorned at. Without having rejoiced over it, without having scorned it, after learning those words and syllables well, they should be laid alongside the Discourses, they should be compared with the Discipline.
If, when these are laid alongside the Discourses, compared with the Discipline, they do not fit in with the Discourses, they do not compare well with the Discipline, you may here come to this conclusion: ‘Certainly this is not the Gracious One’s word, it is not well learned by that monk,’ and, monks, you should abandon it. If when these are laid alongside the Discourses, compared with the Discipline, they do fit in with the Discourses, they do compare well with the Discipline, you may come to this conclusion: ‘Certainly this is the Gracious One’s word, it is well-learned by that monk.’ This, monks, is the first Great Referral you should bear in mind.

That religious group will have no ground to criticize you for the above comes straight out of the Buddha's Discourses. Also freely share good Dhamma resources like accesstoinsight.org, suttacentral.net, tipitaka.wikia.com, etc. so that group members can go and find out the truth for themselves.