You make assumptions that have no truth or merit. But the silliest assumption is that a finite life would be better off ended. No sane person thinks that way.
You are engaging in hyper-rationality, a caricature of rationality. In this mode, one might just as easily say the infinite life is meaningless, since any portion of it is an insignificant fraction of the whole. Even a billion years is zero when compared to infinity.
So you think Prof. Mayr believes in God, and he believes that God created the universe as we know it?
Or, did you allow your knee-jerk reaction to get the better of you? Please try to re-read what I wrote. My simple point is that if Prof. Mayr believes that creationism is wrong, then I'd argue he believes that there is no God, and therefore, no meaning to his life.