I have tried to maintain that philosophy also. My father always told me "never talk religion and politics with family", and I learned early to not talk with my brother about that stuff, because it's just completely impossible to have a conversation with him about that stuff, and it just leads to a fight. So I don't talk to him about it.
However, I think his philosophy is that he just doesn't want me to talk about it period, to him or otherwise. Regarding that mosque issue that I talked about in the Community Forum a bit back, his church was involved in the protest against the mosque. Out of respect for my brother, his church, and his beliefs, I told him on the front end that I was taking part in the pro-mosque demonstration. I told him on the front end, in case I were to show up in the media (I was designated by the group to be a media spokesperson, and I did talk to multiple media outlets), I wanted him to know from my own mouth what my motives were for going out there, and that I wasn't protesting against him, his church, or his beliefs, merely standing up for a cause that I felt was right.
While he did give me what I felt was lip service, telling me that he was proud of me for standing up for what I believed in, the bulk of his message was a lecture telling me that I needed to realize that I planned on moving away in a couple years after I finished college, and that this was HIS community, a community he planned on raising his children and dying in. Seemed clear that his message to me was that this wasn't my community, that I didn't have any place speaking out and standing up for the political happenings. But I suppose I could have been wrong, huh?
There was also an instance a bit over a week ago that he and my friend were talking about my involvement in the mosque issue. They both thought I was asleep. I wasn't. My brother said what he had to say about the whole situation right there in front of me, and finally I spoke up, making one statement, and rather peaceably so. My brother told me not to speak, because I was just going to "open up a can of worms that I don't want", and I responded saying I've been holding my tongue regarding a lot of things lately (I didn't specify, but really it's been his family saying things to me to tell me that they don't accept my religious beliefs, or lack thereof), to which he just said I should "hold my tongue more often" (implying I shouldn't express my opinion - again how I took it)
The worst and final straw happened this past week during our local Congressional primaries. Being a registered Democrat, I voted in the Democratic primaries and didn't take part in the Republicans. There were about 6 or 7 GOP candidates, 1 in particular I wanted to see lose because her campaign has been based upon Bible thumping, theocratic ideas, and mud slinging against Muslims, tying them all to terrorism (specifically the mosque I marched in favor of prior). She lost the primary, and I made a post on my Facebook stating "Thank you sweet Jesus, there is a God, and Lou Ann Zelenik's defeat in the Congressional primary is proof that he loves us" - Never have I spoken to my brother or his family about this election. Never have they revealed to me who they supported and were voting for, and never once did I discuss the election, or my dislike of Lou Ann Zelenik with my brother or his family. It was a post on my own personal Facebook page with my own personal political views. I received a message from my brother telling me to move back to California, a message from his uncle telling me "That thin line has now been crossed", and the 2 of them have, to this point, cut off all communication with me.
So basically, I'm not in a position where I feel that these people, one of them my very own brother, and very close to me, have decided that their political and religious beliefs are more important than their family ties, and that they are willing to cut out very close family members simply for having a difference of opinion, and not being bullied into silence.