While I agree with you that tithing is not a NT command, I disagree with your thought process here. We should not judge the truthfulness of a doctrine by it's acceptance to the general public. Jesus Christ, taught rightly, is going to offend some people. And, for that matter, if tithing (10%) is offensive, stewardship (100%) certainly will be!
I agree that Christ taught rightly, but the issue here is the church as His representation on earth. Maybe I have a false believe in my heart but I feel we are the body of Christ and what we say the world thinks it as if Christ said it. In general I don’t accept a doctrine because the general public accepts it, yet some doctrines accepted by the general public I do accept because they are a true Biblical doctrine.
My whole point here is I think people are turning from Christ and churches that are good bible teaching churches (except for the few bad teachings such as tithing), because of the teaching of tithing.
I don't think 100% stewardship would be offensive for them that are honestly looking for truth. Because 100% stewardship is consistent with the rest of Christ’s teaching but 10% or tithing for NT Christians is contradictory. When someone sees something that doesn't seem right or contradicts, they can go to the extreme or run the other way when they see something that doesn't fit. Sometimes they run to the opposite of that teaching like I did when I decided as a older teen to study and practice witchcraft

. Thank God He got me out of that and back to His truth

.
So in conclusion people look to churches as a representation of Christ (we are His body) and if that body of Christ contradicts itself then people think Christianity is wrong, a weird, fanatic religion that ignores truth. A great example of that is the atheist Christopher Hitchens who looks at the people in Christianity and what they do as reason to not believe. If your interest in seeing this view from Hitchens watch this debate with him.
http://www.tangle.com/view_video.php?vi ... 6c55fdb819
note: I feel this debate is a unbalanced debate against Hitchens but it gets his views across anyways.
I hope this makes clearer what my concern is about the teachings of tithing for today.
Thanks for your comments, I love thinking at things from all angles.
Sam