Sun as the supreme god

In Ramayana, the sage Agastya teaches Shri Ram Aditya Hridaya Shtrotam which states that: "6 Worship the sun-god, the ruler of the worlds and lord of the universe, who is crowned with effulgent rays, who appears at the horizon and brings light, who is revered by the denizens of heaven (devas) and asuras alike. 7 Indeed, He is the very embodiment of all Gods. He is self-luminous and sustains all with his rays. He nourishes and energizes the inhabitants of all the worlds as well as the host of Gods and demons by his Rays. 8 He is Brahma (the creator), Visnu (the Sustainer), Shiva (the destroyer), Skanda (the son of Siva), Prajapati (progenitor of human race), the mighty Indra (king of heaven), Kubera (the god of wealth and lord of riches), Kala (eternal time), Yama (the Lord of death), Soma (the moon god that nourishes), and Varuna (the lord of sea and ocean). In Later Hinduism though Sun was delegate to a minor Deity status while Brahma Vishnu and Shiva became the main deities. According to this verse they are nothing else but Sun and in fact all other gods are nothing else but Sun. Scientifically also this is true since Sun is the ultimate source of energy for all living beings and the source powering Rain, Ocean, Air etc.