It's no wonder people think Bible-believers are insane.
Pick up the book of Genesis and start reading. (This is what most normal people do with a book - begin at the beginning)
You will see a God who creates everything, calls it good and then destroys almost everything because now it's all bad (Noah and the ark). Then he picks a liar and a coward to be the "father of nations" (that would be Abram, later Abraham) and waits until the guy is 100 to fulfill His promise of a son and heir. This guy's relatives (Lot and his family) live in the worst city in the world (Sodom) yet have to be forced out of it to save their lives. Later, these same people (Lot and his surviving daughters) commit incest and God makes nations out of the resulting children.
What is going on in this book?
Well, there's a few things to understand about the Bible.
First, it's an accurate historical record. As we all know, people do some really stupid, horrible things (getting kicked out of Eden springs to mind). The Bible doesn't sugar-coat those things. It shows people in all their stupid horribleness. That's one of the reasons we can know it's true. It shows reality.
Second, the Bible shows God dealing with these stupid, horrible decisions. In every instance, He shows justice tempered with mercy.
The world becomes completely evil; God redeems one family to keep humans alive (instead of killing them all and starting over with bees). He even saves animals because He knows we need them.
Humans forget God, yet He chooses one guy for no particular reason at all to demonstrate His faithfulness to the rest of us. The story of Abraham is the story of God fulfilling His promise because He said He would.
The Bible must be read as a whole. Even though it is many different books, it was written by one Author - the Author who was and is and is to come. He is outside time and sees the whole picture. No part of the Bible is obsolete. No part should be ignored.
If you decide to start at the beginning, keep reading. And remember, God isn't insane.