Helen,
bmerr here. The fact of denominationalism is proof of the wide-spread Biblical ignorance in the world. So much division, all rooted in what the Bible does not say. Sadly, many people don't know what the Bible says, but rely on the preacher to tell them what they need to hear. Truth be told, if more preachers actually told the people what they needed to hear, most congregations would likely shrink dramatically overnight!
Something I noticed awhile back, (first in myself, and shortly after in others), was that while most religious people know what they believe, very few know why they believe it, which is far more important, in my estimation.
Amos 8:11 speaks of a time when there would be a famine, "...not a famine of bread, nor a thirst for water, but of hearing the words of the LORD". Certainly during the Dark Ages, when the Papists kept the Bible chained to the pulpit, there was an excuse for such a famine. But in our day, there is no legitimate excuse for it, and yet it exists. It is simply due to laziness and a lack of respect for God's word that the masses are without knowledge of the truth.
Indeed, Bible knowledge is required (John 8:32), for the truth cannot make us free unless we know it. True unity, which Christ prayed for, can only be had if God's word is held as the absolute authority. It would require many to let go of long held beliefs, which is a hard thing to do, I've done it myself. Frankly, not many are willing to do so.
In Christ,
bmerr