as Christ may be short for Christian as well Christoph(er) and perhaps some more, things are difficult. Also Mary, if from Germany then probably Maria before is a not to seldom name. Chances of finding them would increase, if you had aspecial region or place name in Germany,where they were from. If not, there will be surely lots of couples to which these informations will fit. Good luck to all your researches and best gretings from Germany.