I am a Christian.
You are joined by 2.4 billion people around the world, making it the largest religion.
But of course there are many different  branches in Christianity.
Yes. Actually Christianity itself grew out of judaism in the ist century
Yes Christ was himself a Jew.  But there are Catholic and so called protestant branches too.
Christianity is very diverse. Actually 158 countries practice christianity
Do you know what are the most common Christians communities in America?
Roman Catholics. They are followed by protestants, mormons and other groups.