Is the ruling on coercion into disbelief different for a girl and a boy? And must a girl cling to her religion even if it leads to death or rape?

It is permissible for a person to utter a word of disbelief under a recognized duress, provided his heart remains firm in faith. This is stipulated in the noble verse: ﴿Whoever disbelieves in Allah after his belief—except for him who is compelled [to do so] while his heart is at peace with faith﴾.

Recognized duress is defined as that which necessitates compulsion and dire need, such as killing or striking from which one fears the loss of life or a limb. This type of duress is considered "complete." As for "incomplete" duress, it does not necessitate compulsion, such as imprisonment or light beating.

Patience in enduring harm and killing, and refraining from uttering a word of disbelief, is better than taking the concession and uttering it, due to the narrations regarding the virtue of steadfastness in religion.

In the case of duress to disbelieve or rape, uttering a word of disbelief is permissible, and may even be preferable. This is because uttering disbelief under duress does not entail sin if the heart is firm in faith, unlike rape which violates honor in an irremediable way.

It should be noted that this applies if uttering disbelief frees one from duress. However, if it does not free one, for example, if it results in remaining in disbelief and abandoning religious obligations, then it is not permissible. This is because Islamic law repels the greater of two evils by choosing the lesser.