I no longer have a problem with this, for the reason TKGS said. We don't have the rest of the sentence.
The next word might be "unless":
"In Portugal, the dogma of the faith will always be preserved, unless..."
That convinced me. The next clause could completely change the meaning of the sentence.
What I do have a problem with is how the second secret came out after what it was warning about had already happened, and you can see the same pattern forming with the third secret. Meanwhile, I don't need any secrets, because by putting together the Monarch prophecies with the Apocalypse, and then just using whatever insights I have about the present-day, the economic situation, the corrupt governments, and so on, I am not in much doubt about the general direction of the future, though many details are unknown.