Attn: Theists - What would it take to prove you wrong?

[Sword of Christ]

Verifiable evidence that does not require faith as its wobbly foundation.

Deism would be a good start that would be your scientific foundation. Deism is fairly pointless though so the next foundation is the religion/God that produced the best moral change and progress in the world (the fruits) and a religion that isn't based entirely on the personal experience of just one man (like most of them). So what you have there is a foundation as solid as it can get. All the evidence you need for a strong faith.

For starters, the god would have to manifest itself in a way that could be properly understood and studied by anyone. None of that incorporeal illusion crap and none of that just being a human pretending to be a deity crap.

How about if he incarnated himself physically as man?

Secondly, the god would have to perform supernatural feats that cannot be discounted as mere smokes and mirrors stage magic or technologically advanced hocus pocus.

What about rising from death after being crucified, being pierced through the heart with a spear and buried in a tomb for three days? You can't do that with smoke and mirrors/technology.

Also, the god would have to prove it is the creator of mankind by creating either another human

You could do that with advanced enough future technology such the Replicants in Blade Runner.

Lastly, but probably not least, though it may be harder to verify, one would have to discover whether the god is really a deity or merely a highly advanced alien life-form from elsewhere in the universe that possesses knowledge and power from a process of evolution.

Which would be impossible to do so you would have to believe in them on faith based on their fruits and the influence they would have on the world. Naturally God couldn't appear in physical form to everyone all at once it has to be in specific time and place in history and people would then record what they witnessed. So this fits all the evidence you demanded.