Everything you do is selfish.
This is a neurological fact.
Your brain is biologically determined to attempt to reach the highest state of happiness for yourself(which is selfish).
And for some reason(probably because you are scared from the fact that humans evolved from one-celled organisms) it makes you happy to believe in god and follow everything that is written in an old book.
If you would redefine selfishness as doing something which hurts your environment to make you happy(which is probably what you meant by that in the first place), I would agree with you.
And I found out that only muslims that follow there religion are radical.
And where would you get that from? Just because a few muslims started their own crusade doesn't mean they are all bad. The quran has similar issues as the bible and will also be misunderstood by those who want to misunderstand it.
By the way:
Although you seems to think that you are a good christian, I can prove to you that you aren't, because you don't value god's creation the earth and try to help humanity destroy it.
Actually Hitler and Jesus are much more alike then you think.
Hitler tried to get rid of most religious thoughts in his country.
That created a huge spiritual hole in the society which he then filled by making praising himself and his ideology the new culture.
So a lot of people had kind of a spiritual bond to him(and voted for him).
Many of his kind of brainwashed followers then were willing to die for him and his ideology.
Sure it's not exactly the same as Jesus, but Hitler and Jesus both (ab-)used the same mechanisms of the human brain.
Jesus did as far as I can tell mostly positive things with his power(like telling the people to follow certain good rules).
I personally think that christianity is not really different from other religions.
Buddhism for example tells you to help others so you will be helped if you were to get in a similar situation, which also leads to a positive behaviour towards the rest of society.
The only great difference there is is that you were taught to believe in christianity and probably got raised with the bible and didn't learn to be skeptical towards what your parents told you.