It was for these and similar mysterious reasons, with which Moses and the prophets were acquainted, that they forbade the name of other gods to be pronounced by him who bethought himself of praying to the one Supreme God alone, or to be remembered by a heart which had been taught to be pure from all foolish thoughts and words. And for these reasons we should prefer to endure all manner of suffering rather than acknowledge Jupiter to be God. For we do not consider Jupiter and Sabaoth to be the same, nor Jupiter to be at all divine, but that some demon, unfriendly to men and to the true God, rejoices under this title. And although the Egyptians were to hold Ammon before us under threat of death, we would rather die than address him as God, it being a name used in all probability in certain Egyptian incantations in which this demon is invoked.
And although the Scythians may call Pappæus the supreme God, yet we will not yield our assent to this; granting, indeed, that there is a Supreme Deity, although we do not give the name Pappæus to Him as His proper title, but regard it as one which is agreeable to the demon to whom was allotted the desert of Scythia, with its people and its language. He, however, who gives God His title in the Scythian tongue, or in the Egyptian or in any language in which he has been brought up, will not be guilty of sin.
Source: Against Celsus (New Advent)