I would say that there might not be one "religion", but there most certainly is one absolute BELIEF.
Without digging deep, I'll just mention a couple reasons for this:
In the book of Revelation, John speaks of one singular group of people who stronghold their faith and beliefs in the end time, regardless of what is happening around them, and will be the only group of people still alive who will be saved at the 2nd coming of Christ. (Rev. 12:17)
In the book of Acts, Luke mentions time and time again that the believers were together and had all things in common (2:44), the believers were of one heart and soul (4:32), and the believers were of one accord (2:1).
Of course there are countless stories in the old testament of great feats when Gods children were of one accord, and horrible defeats and entire cities lost when His children were not all on the same page. Needless to say, all secular history books have records of these same events that took place in the Bible.
The problem with this is you're making the one mistake many religious folk make trying to prove or justify: they quote a book/books that means absolutely nothing to the non-religious. To the rest of us those are nothing more than stories, and if you so choose you can use them to help guide your life, but you've already been given the gift of knowing right and wrong. You can do with that what you will.