The ancient anhk symbol evolved into the key symbol of Christianity, because in Egypt it had a 2500 year pagan significance. All over the rest of the Roman world, a cross was a simple tool of execution. Non-Egyptian Christians chose the fish symbol, or used an image of a youth Christ as a shepard, carrying a lamb over his shoulders. The Egyptian Christians smoothed the way to a general acceptance of the cross for Chistianity. I have posted a good example of that on the page with the bust image.
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This image was copied from wikipedia:en. The original description was: This is one of the best examples of the Egyptian origin of the cross as a symbol. It is both Ankh and Christian cross. Anachrome "compatible" 3D image. (if you have red-cyan glasses,