There may very well be one god who however offers different interpretations of his/her existence through a diverse array of religions reflecting the characteristics of their respective people. So a Britain sees a Protestant god, the Spanish a Catholic one, an Israelite a Jewish god, an Egyptian a Muslim one and a Native American sees their own spiritual array of beliefs so on and so forth through Hinduism and Buddhism and other religions.
So there is no need to decide who represents the one true god when all are different views of the same entity as if it were a rainbow of lights shining out through a prism. This would extend to other belief systems as well like Confucianism and Taoism though they may not be considered a religion they are still beliefs and a ray of light from the prism.
So it’s good say for Muslim, Jew and Christian to join together in interfaith dialogue in search of common ground yet it is totally acceptable that they differ from each other like different colors of the spectrum which is still created by light.
And some of these lights may be shared in part for both the Jewish people and Christians believe in Moses and Muslims and Christians recognize Jesus. Even differences within sects of Islam are fine because again they are appealing to the characteristics of different people yet all are Muslim as are all the sects of Protestantism Christian.
The important thing about faith whichever form of spirituality it takes is that it delivers hope to people. So though a billion people follow Catholicism another 6 billion represent a multitude of other faiths and the universe itself is filled with the possibility of infinite religions for where there is light there is hope no matter what the variation.
End