Also, raping of the conquered, standard practice for them. Increasing the number or mooslime children? Not so much...they are not born Muslim, they are born human.
According to Mozlems, the kids they have are born Mozlem, and it is forbidden for them to ever leave Islam. Once a Mozlem, always a Mozlem, or death. It’s being born into a gulag.
Maybe in a moose limb country, and if the rapist can threaten or curse the mother into believing it, it would be moot. However, the kid is still born human, not of any particular cult or religion. It is what the parent(s) bring them up as, not the mixture of DNA.