Full knowledge of God and ZERO knowledge of God
If you read all the scriptures in the world, only in the Vedic scriptures you will find real information on God and in full details. From the Vedic scriptures one can know about His names, His qualities, His pastimes, His appearances, His abode, His associates, and so on. The non-Vedic scriptures give ZERO information on God.
The Bhagavad-Gita gives information on how Lord Krishna is God and the Srimad-Bhagavatam gives details on His pastimes, qualities, appearances, names, and abode. Other Vedic scriptures also give information on Lord Krishna.
There is absolutely ZERO information on God from non-Vedic scriptures. To the non-Vedic followers, God is unseen, invisible, unknown, and un-knowable. This is because, God is One, and He is only described in the scriptures of one religion, Sanatan-Dharma. If you want to know God, you must follow Sanatan-Dharma, this is the only way to knowing God, and in full.
“The whole cosmic order is under Me. Under My will it is automatically manifested again and again, and under My will it is annihilated at the end.” (Lord Krishna, Bhagavad-Gita 9.8)
“This material nature, which is one of My energies, is working under My direction, O son of Kuntī, producing all moving and nonmoving beings. Under its rule this manifestation is created and annihilated again and again.” (Lord Krishna, Bhagavad-Gita 9.10)
“I am the source of all spiritual and material worlds. Everything emanates from Me. The wise who perfectly know this engage in My devotional service and worship Me with all their hearts.” (Lord Krishna, Bhagavad-Gita 10.8)
“Furthermore, O Arjuna, I am the generating seed of all existences. There is no being – moving or nonmoving – that can exist without Me.” (Lord Krishna, Bhagavad-Gita 10.39)
“But what need is there, Arjuna, for all this detailed knowledge? With a single fragment of Myself I pervade and support this entire universe.” (Lord Krishna, Bhagavad-Gita 10.42)
“O Arjuna, as the Supreme Personality of Godhead, I know everything that has happened in the past, all that is happening in the present, and all things that are yet to come. I also know all living entities; but Me no one knows.” (Lord Krishna, Bhagavad-Gita 7.26)
One can read the non-Vedic scriptures for millions of years, but will NEVER find any statements like the above from them, not even close to these statements. This is because, only God can make these kind of statements.