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Wow, so much ignorance in one post. The dark ages were dark because any kind of scientific advancement was blocked by the church. If it wasn't for religion we'd be 300 years ahead of where we are now.

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Nonsense. That picture is stupid nonsense.
Firstly, the reason we
lost the knowledge of the Classics wasn't the fault of Christianity.
Secondly, while it was lost to us, the Islam world was busy forwarding it by themselves. Notice that the Rennaisance
isn't Ancient Rome for a reason.
Hell, thirdly, that chart is just stupid because it assumes no advancement between the fall of Rome and the Rennaisance. You only have to look at the difference in economy, warfare and architecture between the Normandy Invasion and Agincourt to realize how stupid that is.