Peter was not a Catholic. Read your history: the Catholic Church did not even start to organize, let alone appoint popes, until 400 A.D.
It is an
integral part of all Christianity (except Catholicism, obviously) that Peter wasn't a Catholic, and wasn't a pope; because if one of the apostles was pope, then non-Catholics don't really have a leg to stand on. And because it is such an important part of non-Catholic Christianity, the only way I could convince you it wasn't true (and really, it's such a hazy topic that
I'm not even sure if it's true or not) would be to convert you.
And really, converting people is
not something I want to be a part of. I think it's ridiculous to go around trying to tell people that they've been wrong their whole lives, when the converters can't even prove that
they're right. Missionaries really get on my nerves.
(At least that last bit was on topic)
So I'll skip past Peter.
There have been people calling themselves Popes since Peter. First was Linus, then Anacletus, and so on. Until the schism, there was only one group of Christians, who had a pope (for example, Leo IX, who was pope at the time of the schism.).
Catholicism is at least
part of the original Christianity (Eastern Orthodox being the other main part).
And since the catholic church still has a pope, who is in the same succession as Leo IX, you might argue that they are the bigger part (meaning that Orthodoxy is less similar to original Christianity than Catholicism is).
The Roman Catholic Church started the bloodiest, the most inhumane, and disgusting persecution of non-believers ever. Full of coercion and conquest. Definitely not Christ like.
I'm not defending the inquisition, but I'd say that the holocaust was far bloodier, more inhumane, and more disgusting.
And while it wasn't specifically against non-believers, Jews were the biggest target. Catholics were occasionally targeted (2579 Catholic priests were sent to Dachau, and parishioners were also sent to concentration camps. Polish Catholics in particular, though some German Catholics were sent as well. This seems ironic as Hitler was raised Catholic, but he hated Catholicism.). And the few non-Christian, non-Jewish people who lived in Germany at that time would also be sent to concentration camps.