All of it.
I am not sure theologically that one can 'petition the Lord with prayer' (brownie points for who gets the reference) as it seems highly problematic that an omnipotent creator would change HIs mind at the behest of some of these less than desirable characters.
In any case, I do not believe in an interventionist God (more points for that one) so I find such actions as we are discussing futile and hence indicative of a certain lack of intellectual and philosophical rigour.
That is not my objection though - all that is just stupidity that I have described and God knows there is enough of that going round...no, my objection is that this is a means of control.
'Laying on hands' is itself a very interesting turn of phrase. It does of course denote some degree of violence ('don't lay your hands on me!' or 'He laid hand on her brutally') and it is no coincidence that some form of psychological violence is often the leitmotif of fundie sects.
Also of course there is - in the Lacanian/Freudian sense - the hint of sublimation of sex. 'Submission' or forcing a woman into submission.
By 'sublimation of sex' I mean diverted or displaced sex such as can happen when a traumatic experience makes someone incapable of the sexual act but still turned on by other means such as rubber or foot fetishism.
I think it is clear that fundie Xians have diverted sex in this way also - they are notoriously anti-sex and seem to hate the body - but they cannot become fetishists or perverts because they operate in a moralistic restrictive context but it seems likely that this sublimated sex impulse is manifested in such activities as this 'laying on of hands' and other rituals (I once witnessed a preacher foaming at the mouth shouting "Come Jesus Come!!! Come inside us now!!!" which I think needs no further elaboration).
There is also of course the masturbatory aspect to the phrase too..."to lay hands on xxxxx". I think this is also a phrase from the Old Testament story of the citizens of Sodom who wanted to 'lay hands on' the visitors.
Leaving sex aside there are other -perhaps more concerning - very sinister aspects. I believe that this is a practice overwhelmingly conducted BY men and practiced ON women. The woman must be 'in her place'.....laid hands on...branded...owned.
From a socio-political perspective this is undeniably a patriarchal anachronism that has no place in the 21st century and may well in any Feminist critique be a psychological equivalent of rape.