It seems to me that according to your post SBNRs are sitting in judgement on the SARs (Spiritual and religious) claiming they are teaching truths they don't believe in. But I'm not aware of SARs doing that. SBNRs better check their facts. What truths to SBNRs think SARs teach that SARs don't believe in?
According to your post, SBNRs also seem to be accusing SARs of "some sort of guilt/duty/obligation to live a spiritual life only through weekly attendance." and I think most SARs would be highly offended by the accusation that SARs are only spiritual by weekly attendance.
Paul did teach us to not forsake assembling together and to encourage one another to love and good works. Heb 10:24-25. Is this what SBNR's are finding fault with?
Too many churches today have focused upon the worldly administration or the academics of doctrinal study without the actual spiritual mechanics involved, except by perhaps a handful.
The SAR crowd are easily distracted by a worldly Christian culture. Many who do advance to developing doctrine in their flock, tend to fall into academics rather than education,..teaching the soul, rather than obedience first through faith in Christ during their studies.
The SANR crowd frequently identify most churches as being 95% worldly and Christian culture in a less efficient format than gleaning doctrinal academics from other sources, but miss out on the spiritual benefits God has provided in the assembly of fellow spiritual believers.
Paulian vs. ‘Christian’ teachings: http://www.abovetopsecret.com/forum/thread414820/pg1
And there’s a world of difference between not believing something that some others believe and judging those who don’t so believe as lying, condemned atheists.