TBH, I'm not sure why you'd want a replacement for religion.
Human society has done a great job of figuring out how to live with each other regardless of religion, and often in spite of religion. E.g., getting the Magna Carta signed meant going not just against the king, but also against the pope (who still fancied himself a sort of a sovereign over kings) and religion.
Nowadays, we have secular laws to keep the "dregs" in line, again often in spite of what their religion might say. E.g., we don't let them do an exorcism and kill the victim just because their particular delusion says it's the right thing to do, we don't give Muslims free hand to kill their disobedient daughters, etc.
If anything, the bits which still are passed for relevant from the Bible (or Tanakh, Quran, Analects, etc) are so cherry-picked, that really it shows that society _already_ had the moral compass necessary to pick those and not the bad parts. It's not the Bible which keeps the "dregs" in line, it's the "dregs" which are very good at living with each other anyway and at most cherry-pick some line from there as rationalization for what they were already doing.
Of course, that's from the point of view of godless Europe and particularly godless Germany. We got out of counter-enlightenment a long time ago. And had plenty of historical examples of why we don't need to organize ourselves around a religion. We've had the Hussite wars, the 30 year war, inquisitions, and so on, in the name of why everyone should worship the same flavour of God and in the same way and at the same church, and frankly it wasn't the good times. And you can go even further back and remember basic stuff like how the church weakened the HRE in the investiture controversy (you know, the "gang nach Canossa" part) and in various other points, and how we never really recovered from each such screw-up. We learned to function happily without everyone going to the same church on Sunday, and in fact with a sort of a "don't ask, don't tell" attitude to everyone else's beliefs and practices.
Even if the majority aren't atheists, we really don't need religion to keep us organized and living with each other. The fact that one neighbour is eastern orthodox, another is catholic, another is muslim, another is protestant, and each goes to their own church while I play WoW or read the forums, is what I'm talking about. We can function as a city or as a country, even if there is no church where we all get together.
And frankly if Europe can function and have some vibrant communities without requiring them to revolve around a church, I fail to see why the USA needs anyone to give it a replacement for religion either.
Ultimately people will still group to do something or another that interest them. Some will go to some book club, some will go to the pub, some will go compare their photos of squirrels in the park, some will go to a linux user group, some to a fitness club, or some will just celebrate the Lord's day at the mall of their choice. There are plenty of groups you can fit in and topics you can talk about, even if you took religion out of the equation completely.
So why does anyone need to be given an alternative?