Humanity, including you, accepts that Biblegod has been proven to exist.
It is a difficult hypothetical for a lot of reasons.
First, pretty much anything is preferable to infinite torture. For example, would you rather receive oral sex or suffer eternal infinite torture? Yeah, I'll take the oral sex please. Oh really? How about nonstop for eternity? When I think about it, doing anything
eternally becomes indistinguishable from torture.
Second, the concept of eternal or infinite is not something I can wrap my little, human brain around. While it might actually be The Worst Possible Thing Forever, I cannot grasp it, and so might
be inclined to choose it over worshiping a god that sounds pretty awful as well. And I do not say that as an internet toughguy. I say that as someone who just cannot possibly grasp "eternal" or "infinite".
But I think the real sticking point for me is in the quote above from the OP. You say "Biblegod", but the bible does not present a consistent, coherent god. It presents at least two different versions - OT and NT. And you might even split the NT god into the god of jesus H and the god of Paul.
The OT god is a horrible, petty, capricious and vindictive prick. I would be less inclined to choose to worship yhwh over infinite torture (but I probably would). However, the NT god, also known as God with a capital G, is allegedly all loving, caring, wonderful, flowers and puppies. I would be inclined to worship this god even without the threat of torture.
But I do not know of which god we are speaking. Heck, even the 35,000+ versions of xianity cannot agree. So it would help to know which god we are being forced to decide on.