Is one who invited a Christian woman to Islam, whereupon she divorced her husband due to his rejection of Islam, and then the inviter married her, considered a "mukhabbib" (one who incites a woman against her husband)?

Inviting a Christian woman to Islam is a righteous deed and is not considered an act of 'takhbib' (incitement against her husband). If she embraces Islam and her husband does not, and she consequently separates from him, there is no sin upon the one who invited her to Islam if he marries her. Caution should be exercised when inviting a man to an unknown woman (or vice versa); it is preferable that the invitation be conveyed through righteous women.