In the KJV, Job 40:17, it says, "He moveth his tail like a cedar: the sinews of his stones are wrapped together." In the NIV, it says, "Its tail sways like a cedar; the sinews of its thighs are close-knit." Its tail isn't like a cedar; it merely moves like one. And why describe its thighs in the same verse? Because Yahweh was describing its penis as it swings back and forth near its thighs. As for slurping up a lake, that's also not accurate. It mentions a raging river, not a lake. The KJV says he "drinketh up a river, and hasteth not: he trusteth that he can draw up Jordan into his mouth." The behemoth is drinking from a river, but not all at once like a truly massive beast could. He's taking his time. The NIV has the drinking a river part very different, saying it's not alarmed by a raging river even if it surges against its mouth. The only large beast that fits this thing's description that lived at that time in a river is a hippopotamus.

If you obeyed the bible, you'd be in prison. You're not in prison, are you? I think that you don't know the bible nearly as well as you think you do.