Almost all traditional religion was extremely "high-volume". By this I mean that there was an enormous amount of stuff that the 'faithful' adherent was supposed to know and do...
Rituals to memorize; books to read, learn, and be able to expound; a yearly round of festivals; parable, stories, proverbs; songs; codes of dress and wearing of symbols; multiple social obligations and privileges...
The list is literally endless, because no matter how much you have done, there is always more that you could - and probably should - be doing.
High-volume ("H-V") religion was therefore the norm. It is what traditional religions wanted from their adherents, it is what their adherents wanted from their religions...
Traditionally, adherents wanted a whole world of religion, as and when they ask for it. They wanted a Big religion that always has something to say, and never runs out of things to do.
And the religious institutions and authorities want the same - and this synergy led to the power of longevity of Great Religions of the past.
However; the problem with high-volume religion is that it is inevitably passive - passive overall and on average.
HV- R is inevitably orientated (ultimately) towards obedience - and that obedience must necessarily mostly be uncomprehending.
The adherent, even the priest; is required to believe everything, do everything including the mass-majority of what he does not understand - and nobody understands everything.
This uncomprehending passivity is inevitable with H-V religion and therefore obedience is the most highly valued among all attributes; insisted upon by the religious regulatory practices.
Because in practice human ability and motivation cannot absorb masses of stuff, and learn elaborate practices - while also evaluating that stuff and discerning which is valid and necessary, and determining what is core and what peripheral.
When a religion has become really high-volume (and when that volume is continually increasing) there is never sufficient time for checking whether we have actually understood what we have absorbed.
Never enough time to cross check the consistency of all the many things we have been told. Inadequate time to follow-through to the implications and outcomes of what we have been told.
So, in practice, H-V religion is always - and remains - for each and every adherent, a largely undigested mass.
An undigested mass that must be obeyed.
High-volume religion is intrinsically a case of all... or-nothing.
Embrace and live-by the whole lot, or else you are not "one of us".
Passive uncomprehending obedience - or heresy.
The problem with this kind of high-volume/ passive religion is twofold:
1. H-V R no longer works
2. H-V R is no longer what is needed.
1. H-V Religion does not work, especially in The Modern West, because it is not wanted anymore - it has been rejected en masse and increasingly over several generations...
Droves have left the churches; and of those who have not (yet) left, most implicitly reject whatever of their religion that conflicts with mainstream, materialistic secular-left totalitarian ideology.
Religion has become a lifestyle choice, a social convenience or obligation.
2. High-volume religion is no longer what is needed (and this is the deep reason why it does not work) because at this point in our spiritual developmental history it is (I believe) God's desire that Man's religion becomes something that he comprehends, chooses, and inwardly endorses.
By my understanding; in a totalitarian world of universal institution (including church) corruption; Men are now called-upon to be less passively obedient to institutions, including church institutions (which are, anyway, all net-corrupted); and instead required to take individual responsibility for their religion.
If it is to be truly, spiritually, distinct from the mainstream materialism; Religion must become personal, inwardly-motivated, and active.
This means that a Man's religion Must Be understood.
In conclusion; H-V religion is inappropriate and ineffective and obsolete.
What replaces it needs to be a low-volume (L-V) religion; in which all aspects have been individually reflected-upon with discernment directed towards understanding their validity, coherence, importance.
All aspects of L-V religion can be, and need to be, recognized as a personal choice; and then those personal choices can be known as such.
Only when we have a depth of comprehension of our religion, and have actively endorsed them; we can resist the relentless attacks on our assumptions for the mainstream of our society (including the attacks from the institutional churches).
Only a low-volume religion has the possibility of functioning strongly and effectively on a personal basis.
H-V religion is the past; L-V religion, a potentially valid future.