No. Islam, Judaism, Sikhism, Zoroastrianism, and Mormonism do not worship the same god. Although Buddhism and Taoism are considerd godless religions, they do adhere to a higher power. Although Hinduism contains thousands of demigods, there was originally a single, all-powerful deity that ruled them all. Only Judaism and Christianity worship the same god, or God, although Christianity is a branch that believes in a three-part deity (Father, Son, and Holy Spirit). Mormonism is a byproduct of Christianity which redefines the God of Christianity and makes Him an evolved mortal. Islam, Judaism, and Christianity all stem from the beliefs of a single man, Abraham, except that Islam originated through the lineage of Abraham's son Ishmael and Judaism originated through the lineage of Abraham's son Isaac. The god of the Islamic faith, Allah, is believed by Muslims to be the same God of the Bible, however, it was originally one of hundreds of tribal demigods, which happened to be the god of the family of a man named Muhammad, the founder of Islam centuries after Judaism. The Bahá'í faith does claim that all monotheistic religons believe in the same god, but through different means based on the needs of their times. However, it dismisses the discrepancies between these religions which prevent them from being compatible. Following is a breakdown of the "god" of these religions in order of the number of adherents.

      Most of these belief systems recognize a basic deficiency in mankind resulting in immorality or unethical behavior. Call it evil, corruption, or sinfulness, it prevents us from attaining our ultimate potential and can have dire consequences. Asian religions including Hinduism, Buddhism and Jainism believe it to be a lack of awareness, leading to a hindrance in spiritual or cosmic fulfillment. Western religions including Judaism, Christianity and Islam consider this a state of selfishness and disobedience to the decrees of a divine creator, resulting in judgment and punishment in an afterlife, when the immortal soul separates from the temporal, physical body. In all but one of these systems, the responsibility to make things right rests soley on the individual. Only Christianity states that people do not have the capacity to make this correction, regardless of free will. All have sinned and fallen short of God's commands, but God has provided a way to be reconciled and returned to right standing with Him. Most of these systems are incompatible with one another, however similar or rooted in common origins, claiming to be the only right way to perfection. The Bahá'í faith, much like those who do not believe in any religion, erroneously espouses a commonality with the world's major religions and claims that they all worship and serve the same "God." Unlike the ignorance of the irreligious, to do this it must falsely reinterpret the teachings of these religions. Jesus Christ said that the only way to God was through himself and warned of false teachers to come after him. This alienated himself and his followers from all other belief systems.

Bahá’í, the unification religion.

      Bahá’í has been attempting to unite all world religions for nearly two centuries. To do this with Christianity, it has had to reduce Jesus to one of its own "Manifestations" and deny the purpose of his death and resurrection on the cross. According to Bahá'u'lláh, Christ's death somehow infused creation with spiritual energy and that being "born again" simply means coming to know God spiritually via any one of his messengers. That this is similar to how Islam views Jesus is not a coincidence, as the Bahá’í faith arose amidst Islamic Iran. The primary difference between the two is that Islam does not believe Jesus was the son of Allah, as Allah does not beget, whereas Bahá’í teaches that all Manifestations are sons of God, including Muhammad. Both religions also claim that no one has ever seen or had direct access to God, wheres the New Testament reveals that only Jesus has seen God because he is God (John 1:18, 6:46, 10:30). According to John 17:2-3, Jesus claims that his authority over all people allows him to give eternal life and that eternal life is to know the only true God and his Son, Jesus Christ. Jesus said that If anyone has seen him, then they have seen God who sent him, and if they know him, then they know God (John 14:6-11). As far as any Christian should be concerned, the major pitfall with Bahá’í is that Bahá'u'lláh claimed to be the second coming of Christ:

"Behold, how the divers peoples and kindreds of the earth have been waiting for the coming of the Promised One... Verily I say, this is the Day in which mankind can behold the Face, and hear the Voice, of the Promised One. The Call of God hath been raised, and the light of His countenance hath been lifted up upon men... Great indeed is this Day! The allusions made to it in all the sacred Scriptures as the Day of God attest its greatness. The soul of every Prophet of God, of every Divine Messenger, hath thirsted for this wondrous Day... By the righteousness of God! These are the days in which God hath proved the hearts of the entire company of His Messengers and Prophets, and beyond them those that stand guard over His sacred and inviolable Sanctuary, the inmates of the celestial Pavilion and dwellers of the Tabernacle of Glory... The time foreordained unto the peoples and kindreds of the earth is now come. The promises of God, as recorded in the holy Scriptures, have all been fulfilled. Out of Zion hath gone forth the Law of God, and Jerusalem, and the hills and land thereof, are filled with the glory of His Revelation... In the Book of Isaiah it is written: “Enter into the rock, and hide thee in the dust, for fear of the Lord, and for the glory of His majesty.” No man that meditateth upon this verse can fail to recognize the greatness of this Cause, or doubt the exalted character of this Day—the Day of God Himself. This same verse is followed by these words: “And the Lord alone shall be exalted in that Day.” This is the Day which the Pen of the Most High hath glorified in all the holy Scriptures. There is no verse in them that doth not declare the glory of His holy Name, and no Book that doth not testify unto the loftiness of this most exalted theme... To them that are endowed with understanding, it is clear and manifest that, when the fire of the love of Jesus consumed the veils of Jewish limitations, and His authority was made apparent and partially enforced, He, the Revealer of the unseen Beauty, addressing one day His disciples, referred unto His passing, and, kindling in their hearts the fire of bereavement, said unto them: “I go away and come again unto you.” And in another place He said: “I go and another will come, Who will tell you all that I have not told you, and will fulfill all that I have said.” Both these sayings have but one meaning, were ye to ponder upon the Manifestations of the Unity of God with Divine insight." (Gleanings from the Writings of Bahá'u'lláh)

      Jesus warned of false messiahs to come after him and said that his second coming would be apparent to everyone (Matthew 24:22-31, Mark 13:21-27). Bahá'u'lláh claimed to be this second coming with many words of self-glorification, but Jesus said his second coming would be marked with heavenly turmoil, hosts of angels, mourning of unbelievers, and that all would see him in great power and glory. Bahá'u'lláh falsely interprets John 14:15-28 as Jesus sending Bahá'u'lláh himself to his disciples, when Jesus clearly stated that he would be sending his Holy Spirit to them ("But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you." John 14:26). Jesus also made it clear that he was revealing himself to his own disciples and not to the world, that those who love God will obey his teachings (John 14:22-24). Whereas Bahá’í teaches salvation through all Manifestations and the religions they fostered, Jesus said, "I am the way and the truth and the life. No one comes to the Father except through me." (John 14:6)