Muhammad invented Allah, Islamic Prayers and Zakat (Islamic Tax). Omar invented Azaan, Qibla, Hijab, Sharia, and other khalifs published the Quran and Hadis after the death of Muhammad.
Muhammad’s purpose of inventing of Allah and Islamic Prayers was to organize the Arabs against the Jew and Christians. First, Muhammad declared himself a Prophet, and initiated the prayer rituals. He claimed that angel Jibreel came to him and a spring of water gushed out of the rocks in front of him. Jibreel then showed Muhammad how to make ablution, and how to offer prayers to Allah. Muhammad began to pray two Rak’ah (units) twice a day, once in the morning and once in the evening. He went home and told his wife Khadijah about what he had learnt from Jibreel.