Now there are some teachers who believe that man does not have free will.

They hold to the idea that we are powerless to do anything, and are, well, basically soulless robots with the wrong programing in control of our actions.

This is a silly idea.

If we were robots we would not be in need of salvation,..(robots do not sin)

if we did not have free will we could not be held responsible for our actions.
The wind and the rain does not have free will, and so we cant actually blame it's lack of morals for messing up our hair.

You can gauge how much free will humans have by the amount of responsibility we are called to account for.
We look at the bible and find that the result of being found guilty in the Final judgement is eternal hell.

You look at what forever in Hell will be like, and you come away understanding the tremendous amount of free will needed to justify that amount of punishment.