Good Morning Edher;
First of all the name "The Seventh Seal" Comes form a passage from the "Book of Revelation" according to John..Which is a part of the Bible..
Definition of the Seventh Seal..... "The Seventh Seal" is taken from the Revelation of St. John, referring to God's book of secrets sealed by seven seals, the belief following that it is only after breaking the seventh seal will the secret of life be revealed. To the skeptical, such claims as to the secret of life existing — let alone being revealed — are instead to believe in some elaborate hoax, the steady and careful construction of which ensures the endurance of particular ideas above and beyond any recognisable basis.
It also has been thought of as.."What meaning can God give amidst death, suffering and pain"...So it is the on going question of belief or no belief .