I will discriminate against religion and all it perpetuates. All of the hatred, all of the bigotry, all of the supremely unmoral teachings, yes.
It's got nothing to do with the property rights of the home owner. They're offering a commercial service that happens to be based in their home, and if they wish to do so, they should not be exempt from the law (Equality Act (Sexual Orientation) Regulations 2007, as cited in the OP).
As I said above, if they wish to offer a commercial service, they should not be exempt from anti discrimination legislation.
Cool, so that means I and my GF/wife (under 25) should be able to go into a B&B and have a room, with it being discrimination if we are refused for being a couple under 25?
No difference to the gay couple, unless of course you think gay couples should have more rights than people under 25? In which case you are discriminating...