This is the nub of the problem.
I don't personally believe that stinging critiques are going to help evoke a spiritual awakening - yet nearly everybody in modern Britain is heavily pre-immunised against the spiritual perspective; indeed multiply immunised by layers of ignoring, mocking, disinformation and sheer incomprehension: when one defence of materialism fails, another kicks-in.
Then again, most people who are 'spiritual but not religious' seem indistinguishable from the mainstream leftist materialistic masses; probably because the spirituality is not the true bottom-line or bedrock of their conviction- it is too feeble, too vague, too ironic; too much a self-therapy rather than a metaphysical framework.
Probably, one cannot be truly aware of and living-by spiritual (non-material) values unless these are explained and sustained by metaphysics - and that usually implies religion.
The difficulty is apparently that we need religion to sustained a spirituality which is real; and we need spirituality for a religion which addresses the main modern problem of alienation - yet getting them both at the same time is difficult and unlikely, and either alone will seldom suffice.
It can't really be done by argument; but it can sometimes be done by presenting an imaginative vision; when the whole 'picture' is seen simultaneously, in a 'flash'.
That is perhaps what we should strive for - something brief enough to be taken in in one go; and deep enough to have the necessary impact.