Specially after all these years.Knowing the situation in Kuwait and the government, there must be some deeper political related motive behind such an extreme measure rather than a religious one.
No doubt in Islam, as a Muslim, it is a sin to mock any aspect of the religion and we are warned that it is something that can take us out of the fold of Islam BUT there is no death penalty for such a sin. In fact during the time of the Prophet such things did take place, and except for warning those who did them, sternly, that what they did was wrong and can cause them to go astray, the Prophet never even ordered them to be jailed!