So the bible says this about God at Rom 1:20 For his invisible qualities are clearly seen from the world’s creation onward, because they are perceived by the things made, even his eternal power and Godship, so that they are inexcusable.
However, JWs don't really believe this scripture to be true. Whenever something comes out about nature that they don't like they will instead say that it is due to imperfection. Animals are predatory and will kill to survive, well, that must be imperfection. Tiny bacteria and viruses can easily kill thousands of people, well, that must be imperfection. Natural disasters like floods, earthquakes and hurricanes occur regularly, well, that must be imperfection. Homosexuality is a product of genetics, well, that must be imperfection. If we really believe this scripture than we must take it for what it says and not try to make excuses for God. We must look at how things really are and decide what kind of qualities it really shows about God (or if he even exists).