The point being made is..
If you ask a Christian do you have any proof of God existence..
Your called into question by your own question.
You first has to have the evidence to back up what your asking first .
That by the nature of your question.
You don't believe in the existence of God.
Which is the reasonable position to have prior to evidence being given.
So therefore your called into question by your own question.
You first has to have the proof of what asking first.
Otherwise it's useless to continue.
No. The person claiming unicorns exist is the one that has to provide evidence of unicorns. It isn't on others to show unicorns do not exist. And, it is quite reasonable if someone claims unicorns exist to ask for evidence to back up their claim.
The same is true of Bigfoot, the Loch Ness Monster, dark matter, a dragon in my garage, axions, neutrinos, nuclear decays, DNA, prions, or ANYTHING else.
The one making the claim something exists is the one that needs to give the evidence supporting that existence. The one who doubts gets to ask for that evidence. For that matter, other believers get to ask for the evidence as well.
You aren't 'called into question' by asking for evidence.
It seems to me that you are expecting people to believe with no good reason to do so.