What would you do?

i really dont know what to do all my life i have wanted to be an organ doner i even used to have a doner card but it got lost this is something i fell so strong about but my husband and his family dont agree with it he says that its wrong and that you shouldnt interfer with what god wanted he says that if i put my name down then he cant see us lasting because he sees it as a betrayal what do i do do i stick by what i beleive or do i compramise what i beleive and my values for him and do what he thinks is right?