The cross (by which I assume you mean the Latin cross, not the Greek, fitchee, tau, Lorraine, fourchee, saltire, Iona, potent, chi-rho, patee, Maltese, patriarchal, or fylfot) has not always been the Christian symbol. The ichthus was used for the first few centuries of our era, and has been enjoying a resurgence of popularity in recent years as a symbol of the Savior.
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