So to an ignorant Englishman... What the fuck is this all about?
As a fellow Englishman who has been trying to follow the NFL for the last 2 years I hope I can help.
Tebow was a decent quarterback for a college down in Florida. He had a fanatical support base down there and generally people seem to have a marmite-esque opinion of him; either love or hate. However the college game is different to that in the NFL and many pundits said his skills would not equate to the professional level (eg. His throwing motion is not what is desired of a NFL calibre QB). Despite that he was taken in the first round of the NFL draft in 2010 by the Denver Broncos, to the bemusement of many as it was clear he wasn't ready. He played a couple of times during a game last year but nothing spectacular of note.
Fast forward to this season. The Broncos fired the coach who picked Tebow in the Draft. They hired someone else who chose another quarterback to start games in front of him. This QB sucked. The Broncos won 1 and lost 4 of their first 5 games and when things wern't seemingly getting any better at half way through their 6th game Tebow was named the starter.
They lost that game to the Chargers but since then the Broncos, with Tebow at QB, have made a series of miraculous comebacks late in the game to win them.
They beat the Raiders.
The Chiefs.
They beat the Jets with 6 minutes left on the clock.
They beat the Chargers in overtime.
They beat the Vikings in overtime.
Last Sunday they were losing 10-0 to the Bears with less than 3 minutes left. They managed to score 10 points in those last few minutes and also win in overtime. Again.
It has become the standard that Denver will generally be losing up until the 3rd quarter and then Tebow will lead them to a game winning/tieing drive in the 4th quarter.
Add to that the fact that Tebow has very deep Christian faith values you get all the "It's a miracle" "I believe" type headlines and comments being made.
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In real football terms, every fourth quarter in a Broncos game it's half time in Istanbul 2005. Every week. Tebow = Hamann.