How to deal with the Sunday morning God-botherers:
I used to have this problem with the local fundies. You need to bear in mind that these people have a quota to fulfil; they have to visit X houses in Y time. So I did the unexpected; I invited them in, plied them with orange juice and biscuits, let them put their pitch, and tied them up for the next 3 hours trying to convert them to my own "belief": Agnosticism. I engaged them in an interesting and deep discussion about how God, if such a being exists, must by definition be as far beyond our comprehension as a human being is beyond the comprehension of a skin cell in my little finger. And if we, for all our enlightened knowledge today, can't comprehend God, what chance would a bunch of desert shepherds 3000 years ago have? Etcetera, etcetera...
Unfortunately I was not able to convert them to Agnosticism (I'm a good lecturer, but a poor preacher!), but because I took 3 hours out of their God-bothering time, they must not have been able to fulfil their quota, because they never bothered me again!
Other people I know have also effectively solved the problem in other ways:
My neighbour was watering his garden one morning when they turned up. He warned them off; they didn't take the hint; he hosed them down for their pains. They never returned.
When my brother was living with his then girlfriend (who was quite the hottie I might add!), when they turned up she answered the door - buck naked - and gave them a sweet smile and a seductive pose. Being a Christian couple rather than being on the make, they fled instantly and never returned.
When my friend returned from a rabbit-hunting trip, he was skinning and gutting the rabbits when the fundies turned up. He was covered with blood and rabbit guts; carrying his bloodstained skinning knife, he answered the door and informed them that this was the House of Satan. They fled instantly and never returned.
One of these solutions might work for you! :)