Hello Angela,
Well, the word millennium (as a discrete time period) only occurs in one book of the Bible. If it was that important, it would appear in more places.
The above is false thinking on your part and pure conjecture. The fact is that "a thousand years" is mentioned six times from Rev.1:1-7. The context should always be considered first. That said, there is nothing whatsoever in the context that would lead the reader to seek after another meaning other than the plain meaning of a literal thousand years. Anything else is inferred without any basis.
The other reason is that a lot of Revelation is symbolic. It is apocalyptic literature. It is not literal.
The book of Revelation should be read in the literal sense until a symbolic interpretation is obvious and not vise versa. It is these standards that men have created and that people adhere to such as Revelation being "apocalyptic literature" that keeps people from understanding it. Most of the symbolism is revealed right in Revelation itself.
The problem is, some people think every word of the Bible is meant to be read literally, and it isn't! That is why Jesus talked in parables, because he wanted to obscure meanings. Some things are not meant to be known.
Well, the purpose of the book of Revelation which God gave us would disagree with you. Jesus spoke in parables to that generation of Israel, but he said to his disciples and the rest of the church "but to you has been given the knowledge of the kingdom of God.
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"The disciples came to him and asked, “Why do you speak to the people in parables?” He replied, “Because the knowledge of the secrets of the kingdom of heaven
has been given to you, but not to them.
"In them is fulfilled the prophecy of Isaiah: “ ‘You will be ever hearing but never understanding; you will be ever seeing but never perceiving. For this people’s heart has become calloused; they hardly hear with their ears, and they have closed their eyes. Otherwise they they might see with their eyes, hear with their ears, understand with their hearts and turn, and I would heal them.’
But blessed are your eyes because they see, and your ears because they hear."
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The "they" in the scripture above, was that generation of Israel. So please stop applying to the church what was meant for that generation of Israel. As far as the book of Revelation, it's purpose is stated right in the first verse:
"The revelation of Jesus Christ, which God gave him to show to his servants the things that must soon take place."
You need to forget about your hermeneutics and your apocalyptic literature guidelines and just read the book of Revelation, because you're missing the meaning.