Logic? Now there's an old protagonist? ]:)

OK, back to logic. Is it at all logical that what's hypothesised by "them" has any logic to it?

Is the following Illogical?:-

"For all force in the universe there is an equal and opposite force acting and thus the sum of all force is zero.

If the sum of all force in the universe is zero and therefore the sum of all energy in the universe is zero, we could argue the universe does not exist, because all matter is made up of energy."