As Exian said, the honest answer to some questions such as the one concerning abiogenesis or question 2 (assuming it is even a sensible question, which I doubt) is "We don't know -- yet." Furthermore, even if we never know the answers to some of these questions, that doesn't make their position any stronger or validate their belief in their invisible friend. It's just God-of-the-Gaps bullshit.
Question 3 is, as Exian also said, a google search away.
The important thing for you to understand is that theists use such questions to change the subject and shift the burden of evidence. When they ask for your "proof" that their god doesn't exist, they are simply trying to make you forget that they are the ones making the claim "My god exists" and that they must supply evidence for that claim if they expect to be taken seriously. Of course, they don't have a damn thing, which is why they try to pin the burden of evidence/proof on you. Don't let them. Call them on their ploy, insist that they provide evidence for their god's existence (aside from indulging in circular reasoning by quoting their holy book), and don't let them off the hook.
Question 3 is, as Exian also said, a google search away.
The important thing for you to understand is that theists use such questions to change the subject and shift the burden of evidence. When they ask for your "proof" that their god doesn't exist, they are simply trying to make you forget that they are the ones making the claim "My god exists" and that they must supply evidence for that claim if they expect to be taken seriously. Of course, they don't have a damn thing, which is why they try to pin the burden of evidence/proof on you. Don't let them. Call them on their ploy, insist that they provide evidence for their god's existence (aside from indulging in circular reasoning by quoting their holy book), and don't let them off the hook.
