Assuming a biblical timeline, massive amounts of volcanic activity took place during the Flood year and immediately afterward. The volcanic ash from these eruptions would have blocked out enough solar radiation to cool the atmosphere for hundreds of years after the Flood waters subsided—just what was needed to form the thick ice sheets that existed during the centuries-long ice age.
I've read the book, must have missed the part about all the ice that lasted for "Centuries" after the flood. I would have thought that someone may have mentioned it since Noah and his band of survivors probably didn't plan on winter gear when they landed.
Setting your disagreements with the Biblical account aside for the moment, would you not agree that such an event as the Biblical deluge described would have significantly altered the planet in quite a few ways? If there was no precipitation, as described, until Noah et al. boarded the ark, do you suppose they were given rain gear? I’m not quite grasping the level of equipment you’re expecting of deity, here.
The massive boat, should that deity have just popped in into existence in your opinion, with raincoats and parkas hanging by the door, lol? Poor babies, they had to work for it, and they were (gasp!) bullied. You’re engaging in silliness because you do not agree with Christianity or Judaism as far as the current state of the world and how it came to be. Just say that and drop the pretense.