Wearing religion on one's sleeves

If you've done any research about what the Koran says about Muslim women wearing veil and men growing ragged beards, the answer is nothing at all. These obsolete customs are all based on recommendations by prophet Muhammad.

With this in mind, I wonder why Muslim clerics are not encouraging their flock to forget about these medieval practices and get on with the flow. The same recommendations should also percolate from politicians like Trump, for instance, instead of hearing him blocking all Muslims from coming to America, including Syrian refugees.

Such a positive step would facilitate Muslims' integration into Western societies and calm spirits down. I personally don't care for any religion and would rather not see any faith on people sleeves!