Fixed
Hi, I fixed up the Religion in Vietnam lead with atheism as state religion first as per your request, please take a look. The disparity in the pie chart seems mainly caused by that US institute counting 45% ancestor worship and traditional beliefs as religion, wheras officially that 45% are non-believers. It's a bit of a grey area...

Second question: What do you think is better title chữ nho or chữ Hán? To my mind chữ Hán can still include Japanese and Chinese, but chữ nho is clearly Vietnamese-only, and is what Lonely Planet uses. Do you have any view? Cheers!