The last time the Witnesses came to my house, I told them, ‘Sorry, but we’re Muslim here. I was only partly lying because my husband is actually Muslim (I’m not). I’ve found the ‘muslim’ card comes in handy a lot. 🙂 They’ve never come back.
Of course, in your case, Mera, you can’t lie. Like others have said, just be honest. It’s for the best.