What is the ruling on keeping a headscarf (khimar) with the phrase "I love Christ Jesus" written on it, or throwing it away, given that a colleague gifted it, claiming that Muslims believe in all prophets?

It is not permissible to accept a gift from a disbeliever if it leads to affection for them or being influenced by their falsehood, or if it is a means of inviting others to their distorted religion. It is more appropriate to refuse it while attempting to invite them to Islam. If the gift is from a Muslim woman, it is permissible to accept it, but it is not permissible to wear anything that suggests imitation of disbelievers or displays their symbols. Anything written on it should be removed if possible, and an item that can be used should not be discarded.