As you probably already know, Republic of Lagrangia endorses secularism. However this doesn’t prevent us from speculating what form the religion(s) of the future will take. Most prospective Space settlers or Spacers, will likely be quite scientifically mended and will therefore accept scientific facts like the big bang and evolution. However many people, even if they fully accept modern cosmology and biology, will still feel uncomfortable without some sense of divinity.
Many people make great difficulties with combining their acceptance of modern science with some kind of religion. One of these attempts has been made by Bernard Haisch in his book The God Theory. According to his theory, god created the universe by becoming the universe. Haisch’s theory is in fact a kind op pandeism, according to Wikipedia pandeism is:
Pandeism (or pan-deism) combines aspects of pantheism and deism. It holds that the creator of the universe actually became the universe, and so ceased to exist as a separate and conscious entity. Pandeism is proposed to explain as to deism why God would create a universe and then abandon it, and as to pantheism, the origin and purpose of the universe.
Since this theological position is fully compatible with modern science, pandeism might become popular among Spacers with religious inclination living in a highly secular society. Although pandeism in itself is no religion, it might help people to deal with their psychological need for some spirituality without giving up their believe in science.