Jamieson, Fausset and Brown on Deuteronomy 12:29-30

29-30. Take heed to thyself that thou be not snared by following them ... saying, How did these nations serve their gods?--The Israelites, influenced by superstitious fear, too often endeavored to propitiate the deities of Canaan. Their Egyptian education had early impressed that bugbear notion of a set of local deities, who expected their dues of all who came to inhabit the country which they honored with their protection, and severely resented the neglect of payment in all newcomers [Warburton]. Taking into consideration the prevalence of this idea among them, we see that against an Egyptian influence was directed the full force of the wholesome caution with which this chapter closes.