Why do you have to respond to anything? If they're the ones who want to convince you of something, the burden of proof should be on them. Until that proof is met, disbelief is a reasonable response.
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"If you cling to something as the absolute truth and you are caught in it, when the truth comes in person to knock on your door you will refuse to let it in." ~ Siddhartha Gautama
"If you cling to something as the absolute truth and you are caught in it, when the truth comes in person to knock on your door you will refuse to let it in." ~ Siddhartha Gautama