Yahweh uses these questions to scold the people. AT: "You must really fear these idols for you to act so deceitfully ... about me!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
These two phrases mean basically the same thing and emphasize that, although the people should have remembered Yahweh, they did not. (See: [[rc://en/ta/man/translate/figs-doublet]])