In the entire history of mankind from the west only Jesus Christ and Prophet Mohammed succeeded in reaching state of enlightenment. Comparatively in India hundreds of Sages and Rishis succeeding in reaching God in their lifetime!
Teachings of spirituality contained in Bhagavad Gita not only form core of life on mother earth but following Bhagavad Gita any human being world over belonging to any religion faith or belief even without converting to Hinduism religion can reach state of enlightenment followed by moksha salvation. Bhagavad Gita has influenced not only Indian culture but entire world.
Jesus Christ in his missing years (age 14 to 29) came to India to indulge in spirituality contained in Bhagavad Gita and also Upanishads (independent spiritual treatises). The whole wisdom of Jesus Christ is owed to teachings of Lord Krishna in Bhagavad Gita.
Similar is the case of Prophet Mohammed. Prophet Mohammed belonged to Persia a region touching boundaries of erstwhile Bharatvarsha (now India). The complete wisdom of Prophet Mohammed is owed to Taxila University of yore the ruins of which presently lay in Pakistan.
Even though Bhagavad Gita forms part of Hinduism but its teachings can be followed by anyone world over! Bhagavad Gita forms part of spirituality never religion (practice of rituals).
In yesteryears to indulge in Bhagavad Gita seekers often went to deep dense forests in Himalayas to contemplate on God in isolation but in present times no such thing is required. Remaining wherever we were, even in the confines of home we can satisfactorily indulge in Bhagavad Gita.
This is the biggest anomaly of present times that seekers keep searching for a spiritual guru; master to guide them in the spiritual journey of life. Hordes of spiritual retreats, yoga camps, meditation centres all over world were pure commercial centres having nothing to do with actual yoga, path of spirituality as detailed in Bhagavad Gita.
Yoga as in Bhagavad Gita is always indulged in isolation via contemplation (chintan).
The teachings of Bhagavad Gita cannot be assimilated literally otherwise everyone in India would have reached state of enlightenment by now. The teachings of Lord Krishna in Bhagavad Gita form core of Hinduism in India. One may not be able to follow but highest reverence is accorded to teachings of Lord Krishna in Bhagavad Gita.
In Indian courts all oaths are taken on Bhagavad Gita. As per Indians there was nothing more sacrosanct than teachings of spirituality contained in Bhagavad Gita.