Honestly only the saint is really suitable for MC out of these 3, sure they all "like" him but what about MC? He doesn't have a romantic connection to these two lolis at all, it's like he just doesn't want to make them sad so he accepts them, guess it's one of those "feelings can come after marriage" things...
As for the saint, MC clearly is interested in her and goes to her often on his own initiative, what more needs to be said. Just date the saint and hope to go home together.
Even if he doesn't feel much love from his family, they are still are his family, they aren't dead or mean to him, they really do not deserve him to just abandon them for some girls he doesn't really like. At least TRY to go home.