If Christianity is the right religion then which branch of Christianity is right
If Islam is the Only Right Religion then, either Shia Islam is Right or Sunni Islam
If Judaism is right then which branch of judaism
If Hinduism is Right then which School of Thought in Hindus is right
and the list goes on and on and on and onnnnnnnn............
So the Question should be rephrased like this " Which Religion's which Sect is Right" because there are sub divisions sects are almost in every religion.
If you can't figure out which one is right, just settle for the one that's left.