…
But it could happen that someone thinks he/she is looking for Orthodoxy, but is really looking for Eastern Catholicism.
And a Catholic must recommend the fullness of faith. Catholics should avoid
indifferentism and proselytism so cannot in good conscience, per the instuctions of the Magisterium, recommend other non-Catholic religions. It is both
indifferentism and proselytism to recommend that a Catholic change religions (such as to become Orthodox).
Catechism of the Catholic Church has:
904 "Christ . . . fulfills this prophetic office, not only by the hierarchy . . . but also by the laity. He accordingly both establishes them as witnesses and provides them with the sense of the faith [sensus fidei] and the grace of the word"438
To teach in order to lead others to faith is the task of every preacher and of each believer.439
905 Lay people also fulfill their prophetic mission by evangelization, “that is, the proclamation of Christ by word and the testimony of life.” For lay people, "this evangelization . . . acquires a specific property and peculiar efficacy because it is accomplished in the ordinary circumstances of the world."440
This witness of life, however, is not the sole element in the apostolate; the true apostle is on the lookout for occasions of announcing Christ by word, either to unbelievers . . . or to the faithful.441