Bearing in mind that we were created in the image and likeness of the Creator, it's not so funny there are parts of our genome which is far older than 6000 years. Adam was a clone of God, and God has been around since day one, like I explained earlier, billions of years ago.

God's ways are not our ways. Who knows what the reason would be? And as for God creating humans 6000 years ago, there is no evidence of that in the Bible. The original Hebrew with which the book of Genesis is written (and which is usually translated into English as "days") actually means, literally derived, "time periods". We have no idea just how long that "time period" is, so God could very well have created everything over 4 and a half billion years as science has proven. God and science are not mutually exclusive concepts. God created science.