Without a true Pope, how can we be sure of dogma?

C. V., a Catholic has sure Faith in the dogmas because they were proclaimed from the Chair of Peter, whose teaching God will not allow to err. The fact that a Pope is not currently reigning has no bearing on the certainty of those dogmas. Also, the Church does not need restoration.  It still exists, but has simply been reduced to a remnant. 

Pope Gregory XVI, Mirari Vos (# 10), Aug. 15, 1832:“Therefore, it is obviously absurd and injurious to propose a certain ‘restoration and regeneration’ for her (the Church) as though necessary for her safety and growth, as if she could be considered subject to defect or obscuration or other misfortune.”