I have already writ posts that tell amply my opinion that sanAtana dharma/Hinduism is the original religion practiced by the purported patriarch of Judaism, Christianity and Islam. Abraham was named after Brahma, the Creator according to sanAtana dharma, Sarah and Haggar named after Saraswati and Ghaggar (a river tributary to the Saraswati River in India). According to the Torah Abraham and crew came from Ur of the Chaldese, which has been determined to have been rather near the Indus Valley. Judaism, Christianity and Islam are certainly somehow related to the Hindu Trimurti Brahma, Vishnu and Shiva, in that order. As with Buddhism, thus, the Abrahamic religions have root in sanAtana dharma, and as with Buddhism those sought, at root, to respond to the pre-existent concepts of brahman and Atman, the Universal Divine Consciousness and the Divine seeded within each soul and being.
In separating geographically and otherwise from the homeland of their religion and entering new lands, the Abrahamic religions seem to have found need or want to differentiate, though not willing to let go the notion of One Divine, which is what is noted by the term brahman, nonetheless each posit "God" as something other than brahman, which might be denoted by the A as prefix in Abraham, i.e., "not brahman."
Buddhism, as they deal so with the issue of suffering, decided to let go the "All-Powerful God" factor in the question of theodicy, overtly stating, Abrahman and unatma, no Universal God and no Divine already extant in each and as every souls' true Self.
Christianity tries to replace the supposed lack of atman (that they seem like the Buddhists to believe despite the Christians continued belief in a Universal Divine Self) with their "Holy Spirit." I.e., "If not what we/our forbearers once knew as "God" then what? If there is no seed of the Universal Divine already in us, then with what do we fill that hole?"
The Buddhist answer, "Nothing." The Hebrew answer, "Sacrifices." The Christian answer, "Fill that empty space with the self-sacrificing God we killed." The Muslim answer, "Just surrender."
The answer of sanAtana dharma: God as we have and do know Him/Her does exist and is already the root and core to every being. Indeed suffering does exist, but is properly extant to guide or goad us towards action and practice that are blissful yoga (yoke) with the True Self, i.e., suffering is dharma. Suffering can also exist when the vibrations of material reality and experiencing are ill-tuned, as maya (this illusory reality we call reality) is a fine tuned instrument designed for the enjoyment of experiencing, designed to give something to do with eternity.
Patanjali's Yoga Sutra, first three verses:
Herein is Yoga
Yoga is the alteration of sense vibration
that therein Pure Consciousness might abide . . .