Who?

I know there is the odd biblical literalist in power in the US, but have never come across one in the UK. The biggest group of Christians in the UK are Anglicans (who are not usually biblical literalists, although there are evangelical groups within it that might be) and Catholics (church firmly against Biblical literalism, although there might be odd individuals).

I think the reason atheists argue with Bibilical literalists is that its easy. It is somehting of a straw man: you pick a sub-group that is easy to debunk/discredit and then discredit the whole group by association. This has always been a problem: St Augustine talked about the damage done by people who interpreted the scriptures as contradicting what is known to be true in the 4th century.