The situation you describe is probably the hardest thing about making any big change in ones life, especially a change that tugs on the heartstrings as much as religious beliefs do. Getting ones friends and family to allow you to move out of the "You" they are comfortable with and into the "You" that you are now is a difficult thing especially if they have been taught to purposely shun those who make any changes in regard to God that they don't agree with. The more you protest or try to explain, the worse you make yourself look to people who don't know both sides of the story. (this is why the British royals never explain or appologize for themselves on anything.)
You said you have been getting along fine for the past 10 years. Take a look at what has changed to make you feel differently and address that thing or those things specifically. You can't force anyone to accept you, in fact the more you try and the more you want them to, stengthens their original resolve.
It seems like there are 4 choices.
1. Go on as you have been and hope they come around. Get to a place where this shunning business is truly irrelivent to you and only something of meaning to this small group of people you once knew. Try hard to understand where they are in thier own personal development that allows them to treat you this way and behave toward them (whenever contact is possible) as you would have if none of this had happened.
2. Go back and be who they want you to be because you have revaluated everything and now truly think they do have the truth and you have come to appreciate the value in it.
3. Go back and be who they want you to be because the benefits are worth it even if you don't agree with everyting. Who says they have to be or ever have been 100% right or that you have to be a 100% in agreement with the current understandings. After all God knows our hearts and he knows what it is like for you in this situation.
4. Go on as you have been and do everything you can think of (without appearing too pathetic or needy) to win them over. But remember, no one wants to be part of someone elses strategy to acheive an end result. This is what they have been doing to you with the whole shunning business.
With each choice there are pros and cons...rewards and sacrafices. Life is a muddle at best and most people are doing the best they can, calling the shots as they see them and hoping for the best.