God, Is He what People makes Him to be?

From some time now, I have been visiting a Catholic Chat room and discussing some aspects of God's creation and God Himself. I am very astonished of many of the views that I came across. Or was astonished because I came to know some of the things I had never thought of. One said that Adam and Eve are the first Humans. And then I concluded that their siblings must have undergone "Incest". And to my surprise he said that Incest was allowed at some time of Human history. This is sickening. Come-on, todays Homo-sapiens have evolved. They have not ben dropped from the heaven to this world. Humans have evolved from apes. Humans and great apes of Africa share a common ancestor that lived between 8 million and 5 million years ago. These are not hearsay it has been proved from the fossil remains. Even Darwin was criticised for his works on Evolution,Origin of Species, but his's work is the truth not Bible. He was later recognised for his works. Again, once bible said that Sun revolved around the earth and earth is flat and earth is the centre of Universe and what not. All these has been proved wrong.
Here I am not in swords with the Bible but against those evangelist who in the name of God preach wrong things. After all Bible is a creation of Man in the name of God. The same applies for the rest of World's scriptures. Some say that God has made this nature. But it can also be explained with the aid of science too. Though there are still some things that science has not been able to explain. But it wont be long enough when Science would prove these.
And again in one of the discussions, one said that animals has been created to fulfill the desires of man. They have taken birth for the greater good of Human race. Such arguments depicts that we humans are very poor and mean creature. It is very astonishing for me How can God say that Kill animals for your needs? If there is a substitute then we should go for it. Killing animals is cruel. Dont the animals feel pain? It is very wrong to hurt others, whoever it may be, whether animal or man.
But there should not be any contention at the existence of GOD. I never doubt it. I feel that God is a power that we should all respect. But we should not relate him to the trivialities of Human Life. He is above such petty things. He is not only for Humans but also for every other living organism. And to make our needs meet, we should not say that God has said this to do or that to do. It would be very mean of us.