There is very little protein in butter due to the fact that it is made up almost completely of fat. Those who want to get as much protein into their diet as possible will want to eat lots of eggs, chicken, and other foods that have a high amount of protein in them. Butter is generally not very healthy for you because it has so much saturated fat in it and can easily contribute to weight gain over time.
Butter can also raise cholesterol levels which is why it is typically considered to be somewhat of an unhealthy food. Margarine is a better alternative to butter in a number of ways, including the fact that it does not have nearly as much saturated fat and is usually sold cheaper than natural butter.