Here is a very interesting read concerning Bible translations. If you are concerned with the reliability of the Word of God and how it has come to us then you have dealt some of these specific questions. Click the link and read in detail about this interesting (and important) topic, written by Dan Wallace, a premiere Greek Scholar and translator.
Five Myths About Bible Translation
Myth 1: The Bible has been translated so many times we can’t possibly get back to the original.
Myth 2: Words in red indicate the exact words spoken by Jesus of Nazareth.
Myth 3: Heretics have severely corrupted the text.
Myth 4: Orthodox scribes have severely corrupted the text.
Myth 5: The deity of Christ was invented by emperor Constantine.