I am sure this has probably been covered before, but for those who haven't come in contact with it, this website is a great tool when dealing with how to explain and debate from the bible what is wrong with what the watchtower teaches.
http://skepticsannotatedbible.com/
One of my personal favs is Genesis 1: 26, 27-- "And God said, Let us make man in our image.... So God created man in his own image, in the image of God created he him; male and female created he them." -- Genesis 1:26-27
What a second here, God said, let US, make man in OUR image, male and female he created them. Interesting huh? Guess god and the angels are he/she's.