Hi number1anarchist
First of all i'd like to say welcome, i don't think i have come across you before.
For me this is one thing that made me question every other doctrine the JW's came up with. I like you just accepted the 607 date without question.
It will take you time to research it properly. There is much info out there.
Basically JW's get 607BCE by counting backwards the 70 year Jewish captivity from 537BCE when they say Cyrus announced his decree. This is the only way they get to 607BCE.
So what you have to ask yourself first if you were to accept the 607 date, is whether the 537 date for Cyrus releasing the Jews is correct?
Jw's and scolars agree that Babylon was conquered in 539BCE, one of the sources for this is Ptolemy's Canon. However they then go on to estimate that it took 18 months or so for Cyrus to release the Jews bringing us to 537BCE date.
So therefore if the 537 date is based on an estimation, how sure can a JW be that 607 is the correct date? It could have been 538BCE or 536BCE.
There is much info out there as to how secular historians arrive at 587/6 BCE for the destruction of Jerusalem. There is also much out there how this can harmonise with the 70 year biblical prophecy too. One of them being that the rebuilding of Jerusalems temple was completed in 516BCE, another also being that the Babylonian Empire took hold with the defeat of the Assyrians in 609BCE and the end of the empire being 539BCE, therefore a 70 year rule. This however is something that you need to research as there is far too much information to digest in one thread.
It is a rewarding thing to do to look into this. But first of all it would be good to look at how JW's arrive at 607BCE, so to do that you need to look at the pivotal date of 537BCE. Ask any JW how they arrive at 537, you will find it is based on if's and but's.
Feel free to PM if you would like links on any info. There are many people here who have researched this thoroughly, it was well worth the effort in my case.
Paul