If you're doing that stuff to earn or keep your salvation, you are doing it for the wrong reason and that makes them useless for the reason Catholics are doing them.
It shows a gross misunderstanding of what works are all about.
TC....dude....there's isn't a Christian who believes this. I don't know any believer in my circle who has this attitude. In fact it's the opposite. We know we can't do enough on behalf of the Kingdom. Yet at the same time we know any "deed" we do is insufficient for salvation.
As Christians, we are to bear the fruits of the Spirit as noted in Galatians.
We are guided by the Holy Spirit in these matters.
To reverse your logic, is the unsaved person who does "good" things such as feeding the poor, giving money to the derelict, etc.....does that get them into Heaven?
It's the same line of reasoning with baptism.
What is baptism without faith? It is someone getting wet...that's all.
Apart from faith all we do is a waste.
With faith we are being obedient to God and doing those things He wants us to do.
Is our salvation a license to sin? Good grief no!