23) I think God's existence is undecideable
For me it would be choice 23. Allow me to explain.
Different scientific disciplines have pretty much (though not entirely) been able to disprove most biblical accounts such as the global flood, walls of Jericho, some of the accounts in Jesus' life when after he died for instance graves were thrown open and zombies walked around. Also experiments with faith healing have been debunked (no holy spirit there it seems), the unreliable nature of prophecy, as it usually has such a broad interpretation or apologetics will claim the fulfillment was for a certain time period and not meant to be permanent even though Bible texts seem to indicate otherwise.
Then you have the nature of faith. In some experiments people people who tried to pray away someone's illness failed or claimed that they had Holy Spirit couldn't get it to work properly so as to prove it's existence. They then come up with the excuse that it's not god's will for the HS to be used this way. One would think proving the existence of god would be in accordance with his will. But they will always have an excuse that makes sense to their own minds and seem nonsense to most everyone else.
Then of course you have instances where prayer does seem to work or a prophecy does come true. Unexplained or miraculous healings of a person with a terminal illness, premonitions about another person's well-being, intuition etc.
Yet these instances occur in all people of all faiths and aren't just a product of one particular belief system, although Christian apologetics will quickly point out this is satsn working through the other religion.
Now speaking for myself alone I have had some unusual experiences that have defied logic and reason and these took place while I was outside of the Christian practice. So it would seem that despite the insistence of those with the "holy spirit", God speaks to all persons no matter their religion.
It doesn't seem to matter what faith you are, merely that you have faith. Now this can be faith in yourself, in others or in some unseen force outside of yourself that some choose to identify as "God". So be it. If labeling something with a name works for some people then who am I to try to convince them otherwise?