Well, the answer is good for probably about 20 threads on 20 different topics. But to put it as simply as I can, I would challenge you to read a gospel - maybe John - and try to set your antennae to note every time Jesus says you must "DO" something.
....you must be born of water and spirit...
....you must eat my flesh and drinnk my blood...
....do this in memory of me....
....if you love me you will keep my commandments...
Those are 4, real quick off the top of my head. But, again, if you read John (or any gospel) and really keep an eye out for every time Jesus says you must do something, you may be surprised at how many times He puts requirements out there.
Oh, and read Matt 25:33-46. Only those who do corporal works of mercy in that discourse go to heaven. Or how about after the Lord's Prayer, when he says if you do not forgive others then God will not forgive you. Oh man, there's a bunch of stuff like that.