There's obviously a disconnect there, for sure.
But, while we're on the topic, as someone who grew up surrounded on all sides by born-again Christians (who were lovely as people, don't get me wrong), can I take this opportunity to share my own complaint about the whole notion of mission trips to begin with?
Like, the world is full of all kinds of various faiths. Let people believe what they're going to believe. It reminds me of when the Duggars went to preach Christianity to dirt-poor Hondurans... who are Catholic.