Does the Catholic Catechism categorically reject the idea that Christ may have come before he came, i.e. when we knew him?

There is an idea in Judaism that there is/was a messiah for every generation. I have heard some people muse that it was Christ in the Garden, and so I float the idea that during the timeline in which a Messiah was needed, is it possible that Christ has come before, either as: - Just an observer. - A messiah not realized. - A messiah who failed his initial goal. And by "Possible" I mean, does the Catholic Catechism explicitly or implicitly (but apodictically) rules these ideas out as blasphemous or heretical?