It is what we now call Judaism.The Hebrew's religion is called "Judaism".
Changing from one religion to another is called the same for any of them: conversion.
Judaism is the name of the religion.
Pythagoras' religion? There is no such thing.
There religion was called polyteistic
Tecnically, the religion is called Islam and the people that follow the Islamic religion are called Muslims, so yes, being a Muslim counts as a religion.
The Hebrew (or Israelite) religion is called Judaism, religion of the Jews.
A person who does not in religion is called an Atheist - Atheism
Islam is known as the religion and its followers are called Muslims
People who follow the religion of Islam are called MUSLIMS.
the person who brang religion in Arabia was no one! Muslims (who believe the religion called Islam) believe that Allah (god) created the religion from the beginning of time which is also written down in their holy book called the quran.