I think the Roman Catholic Church does need to be reformed on key issues like women and LGBTQ issues but Thomas Tobin makes a good point here. The numbers game gets bandied about too much. The Catholic Church in the West is in decline. So are mainline Protestant Church(like my own, Anglican) that have liberalized their views on these topics. 

By contrast in places like Africa the Churches their are booming and exploding in record numbers. Same thing in places like China and South East Asia. So people aren't really leaving Church because of those controversial issues, though it can be a fact. It's just the general trends in Western society to reject belief in God in general.