Like many people who lost faith, I felt anger with myself for having been 'conned' by such a story. I began to rail against Christianity, and wrote a book, entitled Jesus, which endeavoured to establish that he had been no more than a messianic prophet who had well and truly failed, and died.
Why did I, along with so many others, become so dismissive of Christianity?
Like most educated people in Britain and Northern Europe (I was born in 1950), I have grown up in a culture that is overwhelmingly secular and anti-religious. The universities, broadcasters and media generally are not merely non-religious, they are positively anti.
To my shame, I believe it was this that made me lose faith and heart in my youth. It felt so uncool to be religious. With the mentality of a child in the playground, I felt at some visceral level that being religious was unsexy, like having spots or wearing specs.
This playground attitude accounts for much of the attitude towards Christianity that you pick up, say, from the alternative comedians, and the casual light blasphemy of jokes on TV or radio.
It also lends weight to the fervour of the anti-God fanatics, such as the writer Christopher Hitchens and the geneticist Richard Dawkins, who think all the evil in the world is actually caused by religion.
The vast majority of media pundits and intelligentsia in Britain are unbelievers, many of them quite fervent in their hatred of religion itself.
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