Well, that is a loaded question. LOL!!
The Catholic and Orthodox both DO lay claim. (Protestant denominations have different takes.) The Catholic Church recognizes the Orthodox succession. The Orthodox do not (generally) recognize Catholics'. Very complicated business, this is. And has generated many a knock down, drag out on this board.
Sorry don't mean too. I just don't subscribe that salvation comes only by organized religion.
I don't know of any church that completely follows the Bible today.
On this blessed Easter... I must warn you; If you want the truth, you will have it... in fact, you're asking for it right now. This will be a thread... and I would be humbled and grateful by you and don-o being there. Will freepmail you both tomorrow.