Hi world, and welcome to the board.
Try thinking outside the little box that the Watchtower stuck us in.
For instance, religion is man's attempt to connect with God while Christianity is God's way of connecting with man.
I sincerely believe that all a person needs is Jesus. If they have Jesus everything else falls into place where it should.
You mentioned 'breaking through racial barriers and teaching the same stuff worldwide' and that's all well and good UNLESS what is being taught is wrong and I saw more racial inequality in the kingdom hall than anywhere else. One of my JW friends married a sister of another race who is 30 years older than him and they were treated so bad that they moved almost 100 miles away into a different circuit.
You also said this:
" I have read and seen throughout history that they could have wrong teachings and that yes they have been wrong in the past about some things, jw normally say well we changed and the light got brighter. What is a good reply to that??"
EASY answer... they changed alright and are very proud of their flip flops:
December 1, 1981 Watchtower
Pages 26-27
Paragraphs 1-2
Light from God’s Word has flashed forth, like the sunshine on “a morning without clouds” to illuminate ever more clearly the pathway that Jehovah’s servants must tread.—2 Sam. 23:3, 4.
However, it may have seemed to some as though that path has not always gone straight forward. At times explanations given by Jehovah’s visible organization have shown adjustments, seemingly to previous points of view.
Have a nice day!