They effectively invited the attention of the world into the thinking that evolution theory is just a theory believed out of convenience rather than conviction [if it were a principle, all scientists would have unanimously accepted it)
You do not understand the scientific definition of a theory and are confusing it with a hypothesis. A theory, as used within the scientific method , is a framework of observations and facts. It has to be well substantiated through repeated testing and confirmed as a principal that explains natural phenomena.
Evolution via natural selection is believed by the JW's but on the micro scale ( ie different breeds of dogs or birds )as opposed to the macro scale (speciation, which is where two animals are so different they can no longer breed). Scientific Theories must also be predictive and the theory of evolution has been proven conclusively via genetics.
I urge you to read a scientific book on the theory of evolution via natural selection before you condemn it out of hand. You cannot dismiss something you know nothing about. Wtbts science is wildly out of date, selectively "quote mined" and misleading.
Biologists unanimously accept evolution.
Glad to see you here though welcome😃