There are a few reasons why certain Muslim countries do not allow the propagation of other religions:

Protection of Islamic identity: Muslim countries may view the propagation of other religions as a threat to their Islamic identity and the values that their society is built upon. They may fear that allowing the propagation of other religions could lead to the dilution or erosion of Islamic beliefs and practices.

Political reasons: Some Muslim countries may view the propagation of other religions as a threat to their political stability or national security. They may fear that allowing the propagation of other religions could lead to unrest or conflict within their borders.

Legal reasons: In some Muslim countries, the law prohibits the propagation of other religions. This may be due to the interpretation of Islamic law in those countries or due to political and historical factors.

It is important to note that not all Muslim countries have the same policies when it comes to the propagation of other religions. Some countries may allow it to varying degrees, while others may have strict laws prohibiting it. Ultimately, the decision of whether or not to allow the propagation of other religions is up to the individual country and its leaders.