Alain de Botton proposes importing educational strategies, pilgrimmages, preaching (and numerous other things) from traditional religions into secular life.
Many people have already imported key technologies like yoga, meditiaion and group chanting from the world of traditional religions and into the secular realm.
It does look as though there will be other types of secular "religions" which have nothing to do with theology. Some of the modern end-of-the-world cults closely resemble secular religions.
I expect we will see more religious-style cults based around creating/worshipping future artificial intelligences fairly soon.