Women may not enter if they have their "monthlies"
Do not turn your back to the idols
Walk gently so as not to disturb the devotees
Surrender your drinking water.
There are many religions in India - Hindu is the majority, then Muslim and the rest follow - Buddhism, Christian, Catholic, Jain (in no particular order)
All appear to get on well together which is as it should be in the world.
Some guys do stare at us as if we are aliens - it seems that Westerners don't wander around like we do?