How to discuss religion with believers?

[T0 Th3 M4X]

The best way to dissuade a Christian from his or her religion is to ask them about Koalas and how they came to Australia. Like: once the koala bear got off of the Ark, how did it get to Australia? Koala only eats eucalyptus leaves, and there’s no eucalyptus trees where the Ark allegedly landed. So how did the koala bear get to Australia?

That always "kills" them.

This is exactly what not to do to dissuade anybody.  Seriously, did you even think before you typed this?

"Hey man, you should turn away from your beliefs because of koalas in Australia. Somehow they got there and had to eat eucalyptus."

From savethekoala.com

"An adult koala eats between 200 to 500 grams of leaves each day. Koalas eat mainly eucalyptus leaves (gum leaves). Occasionally they will eat the leaves from some other native Australian trees, and they also use certain trees just for resting in."

Additionally, how the koala got there has nothing to do with its diet.  Plus, why would a "koala" had to have been on the ark?

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, many things in science have no proofs

GC

Citation needed.  In science things aren't taken simply on somebody's word, unlike in religion.

The Royal Society's motto is Nullius in Verba for a reason.

This is untrue. Do you know what science is?  Do you know what the scientific method is?