Troll - :) You provoked me for yet another religious answer on basis on physics... may be little more on the faith side of it... You asked for it.. so all the best....

The Idols are termed Krishna or any God for that Matter...
again it is not the Stone or the Wood part of it.... the symbolic picture/image of Lord Krishna tht is prayed.....

You think it ll make any sense... if I say.. OK this is a STONE.. a window through which i ll be feeling connected to God ????
No...
through tht Idol .. means I see God in tht Idol.... irrespective of wht it is made up of.....
One prays that God tht it sees in it...

Even this is logically contracdictory to the well known and accepted fact tht GOD is every where.....
then why do we need places like Temple Mosque and churches...

Answering this shall also answer... the question you raised about some of your Hindu frens saying tht God in a particular temple is damn powerful and gives wht you ask for....
And here the physics and mystery of Human brain functioning starts....
Prayers... being a believer . you ll accept are powerful...
it is some energy which exists... may be a thought...
wht gives power to it is the intensity ... faith...
faith tht if I ask for this to God... I ll get it...

Intensity opens many channels in you... It also alters the environment... your surrounding... things happen to help us out in wht we endeavor...

In sports.. who wins.... ??
most talented or the one who really has wants to win.. hunger to win.....
Of course Talent is important... but after some stage.. intensity of the feeling matters the most...

this is intensity of one individual...
if this could be cumulated... unified... don you think it ll be more powerful.... ??
Tht is for a Mosque .. a temple.. a church...
many intense prayers are summed up in one place....

Why you think as soon as we enter these places.. they have a Aura of its own.. very different to any other public building....
the thoughts.. the energy level .. the anxiety of people in it affects the environment in these places...

More the intensity in faith of people and trust in the God... more better the Human Mind is fooled to think it ll happen..
and once the mind is convinced it shall...
It does ....

Compare it to people going to Mecca Madina for Omrah and prayers...
God is everywhere....
Praying in the Mosque nearby and at Mecca must be giving you a very different feeling...
same is for the temples .... :) and churches too ....

All this religion and stuff is to make us understand... and convince us ... YOU DESERVE WHAT YOU WANT.....

good enough ???

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Men will wrangle for religion, write for it, fight for it, die for it, anything but live for it