The hypothesis that the cult center was in some such place would explain why it was altarless. It would resemble the cult of Hestia, the sacred Hearth, a cult that was generally housed in public or private buildings and was usually altarless because the sacred fire of the hearth substituted for an altar.
Source: wiktionary
Gradually, the exteriors of stone-mound tumuli took on different shapes, from altarless to altar-equipped and tier-type structures.
Source: wiktionary
But when attending the Quaker service, he still encounters a certain 'special' silence: in the wholly undecorated, altarless room, there is nothing to be heard except 'the crackling of the fireplace and muffled coughing', until, in an odd combination of spontaneity and planning, someone 'moved' by the spirit holds a 'carefully prepared' speech.
Source: wiktionary
The elders silent, glad to hear retold The tales, familiar, of their downthrown gods, Not utterly unloved though altarless.
Source: wiktionary
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