Gita refutes modern Hindu dogmas:

1) God doesn’t menifest in human or any other form: “The foolish think of Me, the Unmanifest, as having manifestation, knowing not My higher, immutable and most excellent nature. I do not manifest, being veiled by the Yoga Maya. This deluded world does not know Me, the unborn and imperishable. “ [Bhagavad Gita 7:24-25]

2) God is not in sun, moon, cow, tree etc “Whatever being (and objects) that are pure, active and inert, know that they proceed from Me. They are in Me, yet I am not in them. Deluded by these Natures (states or things) composed of the three qualities of Nature, world does not know Me as distinct from them and immutable. “ [Bhagavad Gita 7:12-13] “All this world is pervaded by Me in My unmanifest aspect; all beings exist in Me, but I do not dwell in them. Nor do beings exist in Me (in reality): behold My divine Yoga, supporting all beings, but not dwelling in them, is My Self, the efficient cause of beings.” [Bhagavad Gita 9:4-5]

3) you don’t need mediators like idols to worship God; “To those men who worship Me alone, thinking of no other, of those ever united, I secure what is not already possessed and preserve what they already possess. Even those devotees who, endowed with faith, worship other gods, worship Me only, O Arjuna, but by the wrong method! (For) I alone am the enjoyer and also the Lord of all sacrifices; but they do not know Me in essence (in reality), and hence they fall (return to this mortal world).”[Bhagavad Gita 9:22-23] “Fix thy mind on Me; be devoted to Me; sacrifice unto Me; bow down to Me; having thus united thy whole self with Me, taking Me as the Supreme Goal, thou shalt verily come unto Me.”[Bhagavad Gita 9:34]

4) If you can’t then practice; “Fix thy mind on Me only, thy intellect in Me, (then) thou shait no doubt live in Me alone hereafter. If thou art unable to fix thy mind steadily on Me, then by the Yoga of constant practice do thou seek to reach Me, O Arjuna! If thou art unable to practise even this Yoga, be thou intent on doing actions for My sake; even by doing actions for My sake, thou shalt attain perfection”. [Bhagavad Gita 12:8-10]

5) make scripture your authority not your desires and man made rituals; He who, casting aside the ordinances of the scriptures, acts under the impulse of desire, attains neither perfection nor happiness nor the supreme goal. Therefore, let the scripture be the authority in determining what ought to be done and what ought not to be done. Having known what is said in the ordinance of the scriptures, you should act here in this world. [Bhagavad Gita 16:23-24]