BTS,
The argument is weak for the following reasons:
Special pleading, however you cut it, the argument is that everything had a cause except for the proposed first cause.
The argument offers nothing to prove that the first cause is god nor does it address the possibility of multiple gods being first cause.
Your argument that it could in an alternate reality shows that you have failed to understand the authors point. The point being made is that if you accept the statement that there are no real infinites and that this proves god you have to then, by definition, accept that god is not infinite either, not in love or justice or understanding or power or any of the abilities to which theists commonly ascribe to god.
Whilst empirical scientific data may be paradoxical, to then equate this with the paradox inherent in the god hypothesis is laughable. The fundamental nature of the god most theists propose is at best contradictory but since there is no empirical data to even call contradictory let alone paradoxical then there is no equivalency as you claim.
Sure they do. But there is no scientific evidence, which puts them on, at most, equal footing with postulating a creative divinity.
Err, no. If anyone is postulating observational consequences then there is no comparison with a postulating a divine being, They are suggesting that there may be empirical data to prove (or disprove) their hypothesis. Unless you are telling me you have empirical proof of the divine?!
It is timeless existence. This is how God exists
Therefore, since Craig argues that an actual infinite cannot exist in reality
This argument is a good one
So in other words your god doesn't exist in reality! ...At last something we can agree on!