If you look at the setup in the OP you will find that this thread isn't about whether the Bible is fact or fiction.
He's making a logic argument. To counter him, you need to show that his logic is flawed.
OP writes:
If someone has faith then they have 100% certainty
He hasn't specified faith in what. So the question is, if we have faith in something, does that mean 100% certainty (no doubt)? If no explain why, if yes, move on to the next premise.
OP writes:
If they have 100% certanty in something then anything that opposes that must logically be false no matter what the evidence to the contrary.
Now the question is, if we have 100% certainty (no doubt) in something, do we consider anything that opposes that certainty to be false no matter what evidence says otherwise? If no explain why, if yes, move on to the next premise.
OP writes:
Therefore any person of faith is logically unable to objectively analyse any theory or evidence that directly opposes their faith based position.
Now he puts it together. Personally, I don't like setups like this. They give me a headache.
In reality, can he show that someone of faith has 100% certainty (no doubt)? I don't think so.
Can he show that 100% certainty (no doubt) in something means that we consider anything that opposes it to be false despite the evidence? I don't know.
OP writes:
Science requires that objective conclusions be able to be made from physical evidence.
But do scientists actually function that way all the time? Probably not.
I don't think you can counter this because of the way it is set up. It isn't based on anything real.
I don't know how one counters logic statements, that's why I don't like them.
"Peshat is what I say and derash is what you say." --Nehama Leibowitz