Primarily all religions of world talked about same god but attributes varied.
Bible, Christianity believed more in an encompassing God that was compassionate, loving, full of grace for mankind. As per Christian belief human beings are made in the image of God. This proves that Christianity believes in Sakaar form of God (having a form). This is more of a religious belief than spiritual. As per spirituality detailed in Bhagavad Gita God Almighty always was Nirakaar (having no form)!
Contrary to present belief of Christianity, Jesus Christ believed in Nirakaar form of God (having no form). This indicates that followers of Christianity wrongly interpreted teachings of Jesus Christ.
Quran, Islamic Dharma believes in Almighty God that was formless, Nirakaar. Prime reason why followers of Islamic Dharma do not have concept of idol worship! In Islamic Dharma followers indulged in namaz five times a day. This system of prayers to God is purely ritualistic. This way of offering prayers to God makes Islam more of a religious tradition than spiritual.
Contrary to existing belief of Islam, Prophet Mohammed believed in Nirakaar form of God (having no form). This assertion of Prophet Mohammed is not recognized by preachers of Islamic Dharma. Probably the present-day preachers failed to understand the true purport and meaning of teachings of Prophet Mohammed.
Bhagavad Gita of Hinduism rightly surmises definition of God. As per Bhagavad Gita those believing in a personal God believed in Sakaar form of God (having a form). Such religious practitioners as per Bhagavad Gita failed to reach God in their lifetime.
As part Lord Krishna in Bhagavad Gita God Almighty, Brahman in Hinduism always was Nirakaar in form (having no form). Bhagavad Gita talks about spirituality and only spirituality. As per Bhagavad Gita if one desires reaching God, one has to follow path of spirituality advocated by Lord Krishna.
As per Bhagavad Gita, none in this world, no human being can ever comprehend what God Almighty was all about. The most human beings could do was indulge in spirituality to realize God, reach God in their lifetime.
Realization of God means becoming a pure soul atman in the cosmic journey of life. Human beings due to presence of ego failed to realize their true identity. As per Bhagavad Gita all human beings are primarily a spirit, consciousness manifesting a body, a human form.
If we are not the manifest physical body but a spirit, a soul atman then God has to be Nirakaar. The sum total of all souls’ atmans in cosmos in their pure form is what we called God Almighty in all its glory. If an individual grain of sand is an independent soul atman, the whole mound God Almighty. If an individual piece of puzzle is an independent soul atman, the completed puzzle God Almighty.
To summarize it all, the true identity of God is detailed in Bhagavad Gita only. Prime reason why to reach state of enlightenment one has to indulge in Bhagavad Gita alone. State of enlightenment can never be reached via Christianity or Islamic Dharma.