That sounds very familiar... when I left mormonism.. all my mormom friends and family dumped me so fast.. my wife even left and divorced me.. but even though that sucked.. it has brought me closer to God.. and thats all that matters.. when we die.. we take nothing with us except for that relationship with Christ..
But yeah.. mormonism teaches that there is no salvation outside the church.. which is funny because in the Bible it says.. whoever calls upon the Lord will be saved.. it doesnt say.. go to so and so church.. do all that they say.. then maybe I will save you!