We'd have to disagree on that. It was in Blair's time that religious schools suddenly came back, that's not a matter of opinion. The question of how Christian we were before is more so, I'll admit. I'm basing the idea of Britain's secularity based on the acknowledged fact that the church was dying at that time, fewer people claiming it as a religion in census, lower attendance, and the attitudes and opinions of my social circle at the time. I don't think Christianity was a major concern of the 60s/ 70s generation in flower-power times, nor of the 80s scene.
"marriage of the Empire and Christianity."
That is my main point, actually, in regard to religion. You accept Christianity = you accept empire, or at least imperial attitudes. It's no accident that the marriage of high politics and Christianity, in Britain started or at least given a huge boost by Blair, has come back to us from America. Democratic nation states can, in practice, approximate to federations of city-states, or approximate to empire. Federations of city-states, and city-states themselves, have much more longevity. At the moment Britain is approximating to empire, and looking to Christianity to continue its traditional role of legitimisation.