The natural law, the rule of conduct which is prescribed to us by the Creator in the constitution of the nature with which He has endowed us, applies to every human being that was ever born and every human that will ever be born. It is the same now as it was at the beginning of time, and it will remain unchanged until the end of time.
The ten commandments of the Decalogue, the instructions given to us in Scripture and through tradition, the moral teachings of the Church, etc. are all ultimately expressions of or explanations of the natural law.
Some Church laws are derived from the natural law; these are binding on all men. Other Church laws are disciplinary in nature, and as such are binding only on Catholics.
Anyway my whole issue is that it is very dangerous to impose. The Church did in the past during the Inquisition and unfortunately that is what most atheists hate about Christianity.
Christ warned us that society will hate those who follow Him. While Christians have certainly made mistakes throughout the course of history, using how others feel about their actions as the basis for evaluating the merit of those actions is clearly incorrect and defies reason unless one rejects Scripture.
The change does not affect the fact that your assertion that suicide is technically murder is incorrect.