Monotheism was taught by all of God’s prophets & messengers including Abraham, Moses, David, Jesus, and Muhammad.
Deuteronomy 6:4 “Hear, O Israel! The LORD is our God, the LORD alone! 5 Therefore, you shall love the LORD, your God, with all your heart, and with all your soul, and with all your strength. 6
PSALM 62 – Trust in God Alone
1) A psalm of David. 2) Only in God is my soul at rest; from him comes my salvation. 3) He only is my rock and my salvation, my stronghold; I shall not be disturbed at all.
Luke 10:25 On one occasion a lawyer stood up to pose him this problem: “Teacher, what must I do to inherit everlasting life?” 26 Jesus answered him: “What is written in the law? How do you read it?” 27 He replied: “You shall love the Lord your God with all your heart, with all your soul, with all your strength, and with all your mind; and your neighbor as yourself.” 28 Jesus said, “You have answered correctly. Do this and you shall live.”
God ALONE Worthy of Worship
Quran [27:60] Who is the One who created the heavens and the earth? Who is the One who sends down to you from the sky water, whereby we produce gardens full of beauty―you could not possibly manufacture its trees? Is it another god with GOD? Indeed, they are people who have deviated.
Quran [4:125] Who is better guided in his religion than one who submits totally to GOD, leads a righteous life, according to the creed of Abraham: monotheism? GOD has chosen Abraham as a beloved friend.
*4:125 All messengers since Adam have preached one and the same religion. Abraham was the original messenger of the creed named “Islam” (22:78, Appendix 26). “Islam” is not a name, but rather a description meaning “Submission.”
Henceforth, there is only one religion acceptable to God—Submission. Anyone who submits to God and devotes the worship to God ALONE is a “Submitter.” Thus, one may be a Jewish Submitter, a Christian Submitter, a Buddhist Submitter, a Hindu Submitter, or a Muslim Submitter.
Unity of All Submitters
Surely, those who believe, those who are Jewish, the Christians, and the converts; anyone who (1) believes in GOD, and (2) believes in the Last Day, and (3) leads a righteous life, will receive their recompense from their Lord. They have nothing to fear, nor will they grieve. Quran [2:62, 5:69]*