By 2070, Christianity will decline to the point that Christians will no longer be the majority in the United States. So say the journalists, based on a recent Pew study.
Now, the actual study is a projection based on four scenarios. And the conclusion is based on the most questionable kinds of predictions: extrapolating current trends to the nth degree. This is what computer models do – including those that predict climate Armageddon – but they can never account for all factors and fall far short of proving any objective truth.