If a believer demands that I, as a nonbeliever, observe his taboos in the public domain, he is not asking for my respect, but for my submission.
God has made different religions to suit different aspirants, times, and countries. All doctrines are only so many paths; but a path is by no means God himself. Indeed, one can reach God if one follows any of the paths with whole-hearted devotion...One may eat a cake with icing either straight or sidewise. It will taste sweet either way.
Any kind of extreme in any religion is dangerous. It's just a way to control and violate the basic human rights of others. They diminish God in our world.
Science proceeds through constant questioning and analyzing the predominant scientific laws and modifying them if necessary. If science, as the most advanced tool in the hands of rational humanity can have the guts to change itself based on the needs of the time and society, why can’t religion as the most influential tool in the hands of divine humanity, modify itself?