Fun fact. I grew up going to an evangelical church and some of the other kids in the congregation ended up dying in Waco.

It's hard to say the evangelical movement was ever really a religion when there are no specific beliefs everyone signs up to which other Christian movements do not. I guess it's actually more about liberalism in the way you practise Christianity, which is funny as they are though of as very conservative. But of course if all the churches and services/ritual within them are different then actually reading the bible and believing in what it says becomes more important. That's the only thing your faith is focused on. Then it's not surprising that views on things like homosexual marriage are quite homogenous, it's because of the bible not politics. The author is just going straight in there with an assumption that certain issues are only political when for many people they aren't. Then assuming that culture and religions are 2 separate things, they aren't.