WHY NOAH?

Ever wonder why God picked Noah to build the ark and save a seed of humanity. Because of all the people God found Noah without spot or blemish. The sacrifice had to be without spot or blemish. He was the only pureblood line left. When the angels fell with Lucifer they were demonic. They were called the sons of God. The Bible says the sons of God went into the daugthers of men and there were giants in the land. Until the flood these dark angels had relationships with the women which produced an offspring of giants. Noah was the only pure line left. That my friends is why Noah?