I don't really like queueing, especially in airports so I have the egate in Dubai and until recently the Iris scanning method of entry into the UK.
Manchester airport and Heathrow (I believe) are discontinuing the use of the Iris scanners as they aren't time efective.
We now have full body scanners to check for hidden objects about our persons.
I've flown to Canada and the US recently and didn't see any body scanners so I'm not sure which other countries have adopted their use besides the UK.
You have to adopt the position and put your hands behind your head and stand perfectly still for about 15 seconds. When the staff are satisfied you are told to move on. I recently saw a picture of what the people who are operating the scanners can see and it wasn't a pretty sight. I won't post it here as it may offend some but it is available on google. It's quite graphic although you can't really make out any facial features.
To be honest it doesn't really bother me what people can see of my body on a scanner. One is much the same as another, but there can be more or less of it. I don't think everybody will feel like this but what else can you do if you're called forward for a full body scan?
So what happens if you object to the scan on religious grounds and can you? I don't know! How do you feel about your wife being scanned and her body being seen in this manner. Does it offend you?