yeah...the Bible says so much about Mary remaining a virgin, her immaculate conception, being assumed, her appearing in various forms, praying/worshipping her, the papacy, etc.
you really don't want to examine the Scriptures real close on this because the rcc position falls apart real quick.
and I certainly hope you don't appeal to the ECF's because they were all over the board on these issues.
I will not defend the Latin's strange notion of "the Immaculate Conception of the Blessed Virgin Mary", which as an Orthodox Christian, I regard as an attempt to fix a non-existent problem.
However, Our Lady's perpetual virginity, and the fact that after her death, she was assumed body and soul into Paradise, are matters that Christians, whether Orthodox, Latin, Assyrian, Coptic, Armenian or Jacobite, agreed upon until some Germans in the 16th century came up with the strange notion that a shortened version of the Scriptures were a self-interpreting axiom-system from which everything true about not only God, but the earthly relatives of Our Incarnate Lord Jesus Christ, could be proven.
As an aside, I note that Papal dogmatization of the Assumption of the Blessed Virgin Mary is defective not because it affirms that she was assumed body and soul into heaven, but because it fails to condemn the erroneous view, current in many circle of the Latin church, that she did not die.
On what basis do you put the details of the Virgin Mary's life in the same category with regard to the authority of Scripture as the fact Jesus died for our sins, rose again from the dead (as attested by many witnesses) and ascended into heaven, rather than the the category in which Fermat's Little Theorem and the presidency of George Washington fall?