Is owning money a crime? Because money facilitates the trading of such illegal things, too. If/when Bitcoin is regulated in your country of residence and you are obligated by law to declare any possession of Bitcoin but you haven't done so, then owning Bitcoin might be illegal.
It's like you said that having money is a crime. If bitcoin is a crime the world should banned it but as you see now it is not because it is not a crime. I don't want to elaborate my answer so much. You should understand everything by now