In my view...
The Lord has two parts: the unmanifested cosmic consciousness that is unchanging, eternally situated and indestructible
And
The dynamic energy that transforms the cosmos with time.
Purusha is the unmanifested and lies beyond the cause and effect of all the universes.
All living beings are born out of manifested forms of the Lord which is the energy.
The living beings then interact with the three modes of material nature which we call 'upbringing' and then with each other.
Since all living beings are God themselves, gradually with the Mode of goodness they unlock their self. They realize that they are not a body but a soul that is immortal and unchanging.
That's how they merge into the original truth.
Books, Prophets and prophecies do not help in that.
The actual book of God lies within us and by proper practices we can unlock it.
I deny the bible and the Quran because they are scientifically invalid, have very little on personal development and mostly is fear mongering and destructive to personal intelligence. I was a Christian for 2 years and found it to be a waste though my church was very progressive, I still like my church still I m no longer a Christian.
The Vedas are thought to be unauthored... Neither men nor God wrote them and it's meant to allow good births in the next life and though focus on personal development exists, still not the entire truth. Based on rewards and sacrifice.
The bhagavad gita wins my heart because though it's for kshatriyas, still the message of the power of the mind, emotions, sense control, laws of conservation, law of action and reaction is given out vividly and resonates with people of all faiths, color and cultures
Divine or not, it greatly explains everything that is relevant today. No fear mongering, desperation of attention by conversion or unnecessary war against other faiths. Krishna speaks them as his opinions and at end asks Arjuna to Deliberate on everything that was said and then take an informed decision.
Overall Hindu religions are expected to evolve with evidence and even with a dogma, there's no fear of need to convert and kill.
Gita's detailed analysis can be found in many buddhist texts without any God, with few differences. Buddhism worships the mind and knows it's capacity.
No dogma or fear.
Taoism presents many interesting concepts which when combined with the bhagavad gita and Buddhism, creates a new understanding of everything.
So, if I had to choose, I'd choose the bhagavad Gita. As I know God is not a desperate power hungry rape loving genocidal bully and rather the seed of the entire cosmos that can be seen by the self with proper practices, meditation and the 26 divine qualifies.