the dilemma here is the same for any individual who wishes to present the gospel to a non Christian…your statement about creationism verse Theistic Evolutionism is not relevant to the dilemma there (that is something fabricated only on these forums that is simply untrue).
Contrary to the very poor theological claims i regularly read on these forums, people do not leave Christianity because of YEC or Naturalism.
The bible very specifically tells us that people lose their faith in God because of unbelief.
No amount of science changes non belief…and that is because Christian faith isnt scientific, God isnt a science experiment that can be tested with all the usual methods. The dilemma with the scientific approach…some significant examples:
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How do you demonstrate to a scientist that Christ called demons out of an individual (or two depending on the gospel you read), cast them into a herd of pigs who all ran down into the sea and drowned themselves?
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How do you show scientifically that we are following in the footsteps of a man, who rose up into the sky (against the laws of gravity), and dissappeared into the clouds and that one day all those who believe on Him will experience the same phenomenom?
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the record of the travels of the apostle Paul has its very credibility trashed when one reads the biblical claim that whilst shipwrecked on Malta, he was bitten by a poisonous snake and survived. The scientific record shows no evidence of any such species on that island. This evidence suggests the new testament theology, given the miracles examples above, is a fabrication.
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one of the Bibles greatest prophets and prolific writers (Moses) is considered by quite a number of TEists, to be a myth or at least his writings have no historical accuracy.
when you scientist friend eventually stumbles across the above, and a large number of other tales like them in the bible…and he will…how do you expect to convince him that the rest of the bible claims about “God” are not a fairytale?
the challenge is unbelief!!!
Of course there is one avenue for input…naturalism still doesnt have a reasonable answer for intelligence. Even Dawkins wonders if perhaps an alien race from another planet seeded ours. Of course this begs the question, who started the alien race on the other planet that seeded ours?)…so there’s that discussion to be had i suppose.
In any case, a person has to first recognise the case for a belief in God…that is the challenge for you there. I think that the Intelligent Design proponents have a case for you to present there. The probability that a primordial soup produced intelligent life are overwhelmingly in favour of I/D and strongly favour an intelligent creator who “made us in His likeness”