Is it permissible for a Muslim man who loves a Christian woman to marry her in Paradise, knowing that she will enter Hellfire due to her disbelief? And does this align with His (Allah's) saying: "They will have therein whatever they desire, and with Us is more" and His saying: "And for them is whatever they claim"?

This apparent contradiction can be understood. The polytheist who enters Hell will abide therein forever, and none of the people of Paradise would agree to give him a drink of water, because Allah has forbidden Paradise to the disbelievers. This love will vanish on the Day of Judgment; rather, it will turn into hatred and enmity: "Close friends on that Day will be enemies to each other, except for the righteous." The people of Paradise will be given what they desire when they enter it, and at that time, none of them will desire anything but what suits their state. A wise person's concern should be to enter Paradise and attain a high rank within it, and what a person wishes for now will not be the ultimate object of their desire in Paradise if they enter it.