There is a real God Almighty who has intervened in times past to judge His creation.

Are these critics right in their objections?
The dimensions of the ark are given in Genesis 6:14–15. Using the smallest cubit measure, about 18 inches, the ark would have been a minimum of 450 feet long, 75 feet wide, and 45 feet high. This would have given the ark a volume of more than 500,000 cubic feet, a carrying capacity equal to 533 standard stock cars used by modern railroads. The tonnage of the ark would have been between 40,000 and 50,000 tons, greater than any ship until modern times. By comparison, the massive Cunard liner, Queen Elizabeth II, built in 1968, has a tonnage of 58,000 tons.

What about the animals that were on board?
Remember that Noah would not have needed to put marine life on the ark, just birds, reptiles, amphibians, and mammals. The ark would have needed to hold approximately 35,000 individual vertebrate animals—two from each of the 17,000–18,000 known species of these kinds. Even if each animal’s average size was that of a sheep, there would still have been ample room.

 A standard railroad stock car carries about 240 sheep, so the equivalent of 146 stock cars would be needed to carry 35,000 such animals. This would leave space equal to 387 such stock cars for food storage, living space, and whatever else was needed. The ark, as described in the Bible, would have had plenty of room for Noah and all of the animals.

(See The Genesis Flood by John Whitcomb and Henry Morris, 1961, p. 67).

Additionally, the Bible states that the ark came to rest atop the mountains of Ararat (Genesis 8:4). This would be about 16,000 feet above sea level. Water seeks its own level and any water that covered the Ararat range of mountains would, of necessity, have had to cover the rest of the earth as well!

The point is that there is a real God Almighty who has intervened in times past to judge His creation.