During the advent of Kaliyan he bought the powers of various Hindu scriptures including Vedas as boon from Siva, who was the ultimate power and the supreme of Deva Sanga. He also bought the form of Brahmin as boon. He also added several additions to the true scriptures. By this the scriptures and its powers are controlled by Kaliyan. So the divine Knowledge couldn't be achieved through that 'Kali-affected scriptures'. Then during the incarnation of Vaikundar the ruling-power of deva Sanga is shifted from Siva to Vishnu and then Vishnu to Vaikundar, since Vaikundar is the incarnation of the Supreme Ekam. Since for the first time the 'God beyond consciouseness' incarnated in the world, the universal power vested with Vaikundar and so the supremacy. So no God to be worshipped other than Vaikundar since then. Also, since all the previous scriptures lost their substances new scriptures which are unaffected to Kali is given by God to the world and that is Akilam. But on the other hand the scriptures other than that of Dharmic conceptions are completely rejected by Akilam, though the god-heads on those scriptures are accepted.