Did the world end?

1.Harold camping said that the world would end on the 21st, he got this beliefs from reading the bible
2.Harold Camping was wrong.
3.Therefore what the bible says is wrong

Now christians might try to cry out the usual red herings such as 'Harold Camping took the bits of the bible out of context' or 'you have to use common sense when reading the bible' Ofcourse, those are just excuses. I ask, how do you with 100% certainity that your interpretaion of the bible is the one true correct one and that harold campings is wrong.