No, there won't be an end to us. No offence but j2o's post is just a senseless guess.
Our earth might get spoiled by pollution, natural disasters, etc but like it's not gonna die or some stupid things people say.
I do believe coz there are some people who do wrong things and they don't get punished in his current life. The cycle of karma gets him in his next life.
It's like you watch cartoons maximum before the age of 15 but since when you feel it so childish and non-adult, you're being moulded to the environment situation so you stop watching them.
Never. Religion will never die and 70% of people do believe in god so obviously there would be a majority of people who pray god, go to church, and do what they believe in (Like common beliefs), and this will never end