That may be your interpretation, but its not mine. I am not christian and have no trouble following them, because they are so general and open to interpretation.
It's not a pick and choose kind of religion, even the christian-addendum.
And yet there are hundreds of denominations that do exactly pick and choose. It seems you are the one insisting that you cannot pick and choose. (And obviously church leaders would prefer you dont pick and choose, but usually they do as well).
The overall vibe from my Christian religious education was that as long as you are striving to be a good person, you have a place in Heaven. To err is human, and Jesus died on the cross to absolve mankind of their sins. This made atheism an obvious choice, because I do strive to be a good person, so no need to go to church and have someone else tell me what to do.