How to discuss religion with believers?

[BrianSoddingBoru4]

... many things in science have no proofs...

I'm not sure you know what that means. The only thing science cares about is evidence. In scientific terms, proof is a term used to reference evidence that supports a theory not that it is an absolute sum of all knowledge. In theism, proof means that the evidence supports an absolute as the sum of all knowledge. The theists definition of proof does not actually exist in science.

The nuance is important. Not only does it have a completely different meaning in science and religion, but how the word is used in scientific terms distinguishes actual science from junk science.

^This.  I think it was Asimov who defined 'proof' in relation to science as, 'Established to such a high degree of certainty that to withhold provisional assent would be perverse.'

Which means (to me, at least) that anti-vaxxers, climate change deniers and creationists are all perverts. 

Boru