According to census, over 2 billion.
Chistianity, Islam
Chistianity became popular because Rome adopted it.
God.
Chistianity
yes
29 AD
In Chistianity they worship God.
How many people in the world practice Buddhism?
what happened was christians forced many germanic & pagan peoples to convert or die & many indiginous peoples maintained independance.
It is estimated that there are around 14 million Jewish people worldwide who practice Judaism.
Israel of course, and then to Rome and westerly from there.
1,965, when Jesus made or created christianity.