God promised to preserve His word for all generations. Can you show where He promised to preserve Sodom for all generations? You analogy falls flat.
>>Why would John give this warning if it weren't possible to alter his words?<<
Who said it wasn't possible to alter His words? The Catholics did it, the Mormons did it, and the Muslims did it. That doesn't negate the fact that His word was still available to any who wished to search for truth. Once again, you analogy fails.
>>Where are they seeking?<<
All the wrong places. Their seeking among the likes of Mormons, Catholics, Muslims etc. They are seeking among men who will "tickle" their ears. God didn't say all would find it. In fact He said many would not. He even blinded some to it. That still doesn't negate the fact that His word was still available to all generations.
>>Where are the words of the Lord to be found?<<
Among those who He called to be His as it has been throughout all generations just as He said.
>>What you're doing is back filling gaps in your beliefs<<
You are supremely NOT qualified to judge what I am doing. I am taking God at His word and trusting that He kept His word throughout all generations just as He promised.
>>God allowed His Son to be killed and His Apostles to be cast out and killed, but whoa don't you touch that Bible!<<
God prophesied through the prophets that He would give His son to save and that those who followed Him would suffer persecutions. He has done just as He said He would.
>>God had His prophets store His words away until mankind was again ready to believe the truth.<<
Show where He prophesied that in scripture.