The window at Haycombe Crematorium, in Bath, Somerset, will be ripped out and replaced with a clear glass pane as part of a £140,000 facelift.
It is the last remaining Christian symbol in the chapel and bosses say they will now make a 'mobile' cross available for mourners to use if they wish.
But the decision has been met with a furious response from campaigners who claim it is another example of Christianity being sidelined in modern society.
Hugh Mackay, 82, a former Christian missionary in Nigeria who lives just ten minutes from the crematorium, branded the decision an "attack".
He said: "It seems there is a determined secular campaign to try and obliterate our religious heritage in our country. Read more...