You pose good questions:
Q. If God really wants us to know him, why would it be so difficult for mankind to get a similar or correct understanding of his word the bible?
It would not. A true God would not place his important teachings in a book that has to be translated, interpreted and misinterpreted by a certain group of people. A true God would place the answers in the earth and the world around us so that anyone could understand them.
Q. Why would Satan be allowed to corrupt or alter God's word when there are honest people truly seeking to learn about God thru the bible?
A true God's word would not be corrupted. The idea that God created a being to oppose him and torture mankind is absurd.
Q. Why are there no miracles, prophets or divine influence in modern times the way it was in bible times? Especially considering that our time period is one that has the greatest need of any other period in human history?
I think there are miracles. Humankind has walked on the moon, eradicated certain diseases, life thrives often where it would seem impossible but it does, the universe continues. It is all miraculous. One of the greatest miracles is human intelligence - any religion that speaks against education or higher learning is obviously a false one.
Q. If angels were persuaded to leave heaven and join in with Satan, why would God banish Satan and all his demons to the Earth where imperfect humans dwelled? If angels who lived in the very presence of God fell prey to Satan what hope is there for humans?
It doesn't make sense that an omnipotent God would create a being to oppose Him and allow the fallout of this battle to effect humans. It's absurd. It also doesn't make sense that an omniscient God would need to 'test' humanity by allowing evil to rule to separate the wheat from the chaff. An omnicient God would know the good from the bad without a 10,000 year test.
Q. Why have humans through-out bible history been punished with death, yet Satan and his demons have lived for thousands and thousands of years? Also has there been any human who has sinned against God the way Satan has?
Because imperfect men wrote the Bible as a means to explain the inexplicable, justify their wars, their prejudices and their mysogeny and keep their children and their enemies in line.
JMHO,
Silverleaf