All the Prophets had the same religion: Islam
Allah said in the Quran what means: Whoever seeks a religion other than Islam it will not be accepted from Him . Allah also said in the Quran what means: Certainly the only religion accepted by Allah is Islam.
Islam is the only true Religion. By following Islam one is ensured happiness in the hereafter. Allah chose trushful men and send them as Prophets to the people to teach them the creed of Islam and matters that will help them both in this world and in the hereafter. All the Prophets were Muslim, their Religion was Islam, they all believed that Allah is One without any partners to Him. The first Prophet was Adam and the last was Muhammad, prace be upon them all. Allah sent 124,000 Prophets, their Religion was Islam. They all ordered the people to believe in One God that does not resemble anything, that does not need anything. As for the Islamic laws revealed to the different Messengers there were some differences among them, for example in the times of Prophet Jesus and Musa, peace be upon them, Muslims were only ordered to pray two times in the day and night. However in the laws revealed to Muhammad SAWS, Muslims are ordered to pray five times in the day and night. Nowadays we are in the era of Muhammad's Prophethood so we apply the laws revealed to Muhammad while believing in Muhammad and all the other Prophets before him. Likewise in the times of Jesus the Muslims used to believe in One God and they used to apply the laws revealed to Jesus, believing in Jesus and all the other Prophets before him. In the time of Moses the same thing. The Religion was Islam. The two testifications of faith in his time were: I testify that no one is God but Allah and I testify that Moses is the Messenger of Allah. Meaning we believe in Moses and all the other Prophets before him, but we apply the laws of Moses why? Because Moses was the Prophet of that era.
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