While resultant species believed to have evolved are evident, no one has ever come up with fossils of transitional species or a chain of evolving transitional species all connected to the resultant. Also, take the human being, there are no surving transitionals, only the final result. Hence, everything roaming the earth is a resultant species from the mechanics of the evolutionary process. But there should also be around the other species that connect everything together. There aren't any. --There are a lot of explanations though.
You presumably had to read information you initially found troubling in order to see the light and leave the JWs behind. Why not put the same critical thinking to use and read a book about transitional fossils.
HINT: All fossils are transitional.