You may have some understanding that in the Vedic literature there is mention of many demigods. But the demigods, they are also living entities—a little more powerful than the human beings, that's all. Just like here, in this world also, we find somebody is more powerful than others. But that does not mean he is God. God is supreme, all-powerful. Here you may be a little more powerful than me, but another may be found who is more powerful than you; another you can find more powerful than him. In this way go on. There is no limit. Anyone, you will find somebody lower than him and higher than him. But nobody can say that, "I am the supreme." Nobody can say. That is not possible.
According to our Vedic literature, Brahmā, the creator of this universe, he is considered to be the highest creature within this universe, but he is also not God. That is stated in the Śrīmad-Bhāgavatam: tene brahma hṛdā ādi-kavaye muhyanti yat sūrayaḥ (SB 1.1.1). God instructed him to create. Ādi-kavi. He is the original creature within this material world. Somebody may question that "If he is original creature, than how he got this knowledge of creating?" So that is explained: tene brahma hṛdā ādi-kavaye. Hṛdā: "from the heart God instructed." God is situated in everyone's heart. That is called Paramātmā. Īśvaraḥ sarva-bhūtānām hṛd-deśe arjuna tiṣṭhati (BG 18.61). God has got three features: Brahman, Paramātmā and Bhagavān. Brahman is impersonal feature, and then Paramātmā, the localized feature, and Bhagavān, the personal feature.