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[Hermes777]

There may be more religious content than it seems, but for all of that it is not overtly religious and is clearly not ecclesiastical. As you say, there may be heraldic symbolism, but heraldry is largely the symbolism of the nobility. I suspect there are heraldic allusions (specific to the Sud Tyrol) but I'm not sure they are put to theological purposes, other than the expressions of piety we might expect in almost any work of that period.The heraldry doesn't change the fact the manuscript is not very religious overall. Its background is more aristocratic than ecclesiastical. 

In any case, as Antonio says, the influence of Lllull on the text is from his methods and the work doesn't share in Llull's religious ambitions. Llull devised his systems for missionary purposes. The Voynich may be more Christian than meets the eye, but it doesn't seem to engage in inter-religious debates or apologetics of any kind. Llull's methods are being put to secular purposes.