I tell them my story is actually quite different, and it starts back when I was an atheist...
See, I believed in a naturalistic origin for the whole world, and all the universe - a paradigm entirely without God or gods. And I wanted to know how to be able to really defend my beliefs, and take those Christians to task in scientific and logical terms. So I began studying "the texts" - I began studying evolution in detail.
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Naturally, I sought answers. If I wasn't finding them in the books, I figured I'd ask people who should know - professors and scientists. But when you start asking questions about the dogma of evolution - when you start expressing doubts about their deeply held beliefs - they spout pat answers. They don't really answer the questions - they avoid answering directly. Then they start getting nervous, and looking at you askance.
And then their eyes flash, like they know you, and
they point their knobby fingers at you, and they shout, "Heretic! Heretic!!!"
And then they send the mob with torches after you....