challenging the faith of family and relatives

I have a Catholic friend whom I sent a video which outlined the unbiblical practices and beliefs of Catholicism. I felt a little strange after sending it, and her response was very defensive, although she didn't refute any of the points that were made in the film.

I also have an aunt who is a Mormon. Today I came across an interesting video interview with a family who has left the Mormon church because of its false teaching. I sent this video to my aunt, and right away had that same nagging feeling. 

I think by nature I want everyone to be happy and to like me, but when it comes to watching people I care about put their trust in organizations/religions that are clearly unbiblical, how can I NOT say something?

I became a Christian about 2 years ago and many of my old friendships have drifted, and my sharing my beliefs about abortion and homosexuality have certainly made them fall away much quicker. 

My question is, should I keep my "controversial" beliefs, or those that could be seen as "stirring the pot" to myself? Some relatives already think I'm very narrow-minded and are offended by my beliefs.  For the sake of sharing the gospel, would I do better to keep quiet on touchy subjects and focus more on sharing the love of Christ with these people?

Thanks for reading this, and thanks in advance for any thoughts,

Jenny