Of course Protestants practice Baptism....one of the few Sacraments they honor....and of course when you are validly baptized....you are Baptized Catholic....there is no other way possible....now you may not practice Catholicism, and may fall away from the church....but you are Catholic......If you desire to return to the Catholic church....you won't even have to be Baptized again.....you are already Catholic......Exciting isn't it???
Sorry but baptism does not make anyone Catholic.