Article 4 of the federal constitution states that the federal constitution is the supreme law in Malaysia and since it is mentioned in Article 3 in the federal constitution that Islam is the religion of Malaysia, that means this official religion extends to Sabah and Sarawak too. The fact that other religions may be practised in peace and harmony does not mean Islam is not the official religion of Malaysia.
All provisions of the federal constitution extends to Sabah and Sarawak unless expressly excluded by the constitution itself.
There is no grey area about this unless the federal constitution expressly exclude Islam as the official religion of Sabah and Sarawak.
If Islam is to be excluded as the official religion in Sarawak, then, the Sarawak Constitution also needs to expressly exclude or mention that there is no official religion for Sarawak.
Again since Agong is the Head of Islam in the federation, the Head of State of Sarawak has to be a Muslim because he is the representative of the Agong in Sarawak. He's appointed by the Agong as Head of State and naturally Agong has to pick a Muslim to represent him in the state.
Therefore to say Sarawak has no official religion erred. The having of an official religion therefore is contrary to the wishes of our forefathers in Sarawak to have an official religion for Sarawak. Since it is in the constitution that Islam is the religion of the federation of which Sarawak is part of the federation, political leaders and ministers in the GPS Sarawak government should take steps to get the federal constitution to be amended so that people will not be confused about Islam in Sarawak.
For ministers in GPS government to clarify the matter through the press or a joint statement of all political parties that they will or has opposed the guidelines to be extended to Sarawak is not a way to resolve the matter.