Soon after making first contact ...

  A humanoid alien held up samples of worldly religious texts.

  "I've come from afar seeking your help."

  Followers raised their hands in praise.

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  "All I ask is one thing in return ..."

  It displayed oddly shaped tools.

  "Help me gather resources for the needy throughout the galaxy."

  — — —

  A cloaked ship orbited Earth.

  "Sir, I've spotted another one."

  "Let me guess: offering a holographic paradise and secretly healing with our ubiquitous nanites?"

  "Easier than that, sir. Nanites, yes, but appealing to their deeply engrained religious beliefs."

  "All right, prepare for an arrest."