To worship a type of demigod for certain type of benefit, at least it indicates that you can get the benefit from higher authorities. Indirectly the higher authority is accepted. Or otherwise we become atheist. To save the general people from atheism, there is recommendation for worship of different types of demigods.
Generally, they are recommended—five: the sun-god, the Gaṇeśa, the Viṣṇu, Lord Śiva and Durgā, and... The sun-god I have already said. Five, pañcopāsanam. Five: the sun-god, the Gaṇeśa, and the Durgā-devī, then Lord Śiva, and then Viṣṇu. This is also gradual evolutionary. People in the most lowest stage of humanity, they are struck with wonder by the power. As soon as there is some electricity, they feel some power. So when there are power worshipers... The modern scientists, they are power worshiper. They have gone up to the sun-god. Not god, the sun globe. The power is received from the sunshine. So this is one stage, power. In this way, one after another, when one comes to the supreme powerful, Viṣṇu, because that is the ultimate powerful...