Lord Carey, the Former Archbishop of Canterbury, says society is becoming "increasingly illiterate" about religion and Christians are being forced to hide their beliefs in the workplace.
He is urging people not to "apologise" but to speak up for their beliefs.
It follows a report commissioned by the Equality and Human Rights Commission (EHRC) which asked people about any incidents in the workplace relating to their religion.
Writing in the Telegraph, he said: "Now, more than ever, we need Christian people to speak up for their faith, to articulate their beliefs in sensible and courteous ways. Our society needs a reminder of our foundational beliefs in honesty, faithfulness, right and wrong.
"Don’t be intimidated by a hostile workplace, challenge the hostility with good humour." Telegraph.
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