I think what kawaii means to say (and should instead say) is that Protestant theology has as one of its implications that God lied. That is quite different than saying that Protestants worship a different being (i.e. one who lies) than do Catholics and Orthodox.
-A8
I think you are trying to put words in kawaii's mouth. Kawaii was not speaking esoterically about having a difference of opinion about what God said, but rather he is accusing protestants of worshipping a wholly different God, i.e., an idol of their own making.
I knew exactly what kawaii was saying and the sentiment that went with it. He does not believe that Protestants and Catholics worship the same God. Yet he does not seem to condemn the idea that Catholics and Muslims worship the same God. I know that they don't, but there appear to be a number of Catholics (and even Popes) who are woefully ignorant of that fact.