I don't know if a semantic distinction can be shown between actual pagan religious practice
and those elements of the old religion that survived in popular culture while being divorced from
their original beliefs.  It is possible that the acts of a sénaire or a druí were seen as based upon
religious ritual as opposed to the mere magic of a corrguinach or the lucht na bpiseocc.
Christendom tolerated superstition, but not actual idolatry.  A monk might be happy to
preserve an old legend, but his true beliefs would be echoed in the Félire Óengusso:
    Senchathraig na ngennti
    imma rérad rudrad
    it fássa cen adrad
    amail láthrach Lugdach
    Ind locáin ro gabtha
    dessaib ocus trírib,
    it rúama co ndálaib
    co cétaib, co mílib.
    Ro millid in genntlecht
    ciarbo lígdae lethan;
    ro lín flaith Dé Athar
    nem, talam la trethan.