That is a good point you made, as the Bible was sealed till the
end of the age of prophecy, NOT till the end of time.
Daniel 12 explains why the Christians would misinterpret and thus misunderstand the Bible.
Christians have misinterpreted much of the Bible because they did not have the
key to unlock the meaning. Because of the way the Bible was written, misunderstanding and misinterpretation of the Bible has been a big problem since the very beginning. Christians disagreed as to what the Bible meant and none of them clearly understood much of what it meant, and that is why there are so many different sects of Christianity. That is understandable because it was prophesied by Daniel that the Book would be sealed up until the time of the end, meaning nobody would really understand it:
Daniel Chapter 12:4 But thou, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased. 8 And I heard, but I understood not: then said I, O my Lord, what shall be the end of these things? 9 And he said, Go thy way, Daniel: for the words are closed up and sealed till the time of the end. 11 And from the time that the daily sacrifice shall be taken away, and the abomination that maketh desolate set up, there shall be a thousand two hundred and ninety days. 12 Blessed is he that waiteth, and cometh to the thousand three hundred and five and thirty days.
Now, Christians continue to interpret the Bible the way it has always been interpreted...
The "Book" was intended to be sealed up until the time of the end of the age of prophecy, until the thousand three hundred and five and thirty days came. A day is a year according to the day-year principle, and the 2,300 years came in
1844 when the Bab declared His mission, and the book was unsealed by Baha’u’llah. The math is explained in Some Answered Questions,
10: TRADITIONAL PROOFS EXEMPLIFIED FROM THE BOOK OF DANIEL.
We do not have to run to and fro anymore. Unsealing the Book means we can now understand the true meaning of the Bible. By reading the Baha’i Writings that explain the true meaning of the Bible, we can understand what much of the Bible means that could never be understood before (knowledge shall be increased).
I am not saying that Christians did not understand
anything in the Bible, I am saying that they did not
fully understand the Bible... As Daniel said, we will know more in the future, in 2300 years:
4 But thou, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased.