Omniscience Vs Freewill

Since the beginning of time man has acknowledged the presence of a higher
power or God, which has resulted in numerous religions. Religions have also
been the single largest reason for world population to be divided since
religions propagated different philosophies and practices. But one quality
of God that all religions have accepted is Omniscience. All of them accept
that God knows all and there is nothing that is not known to Him. Another
common preaching of all religions is the power of free will, if one does
good the result is good, whether you get these results in this life, after
life or next life is debatable. But all religions agree that result of good
actions is good and bad actions are bad.
Thinking about these two concepts more closely, they seem to be an oxymoron
to me. God's omniscience and man's free will that is. Since omniscient is
someone who knows all, He knows all past, present and future. He knows all
my actions and their results. He knows all my thoughts and intentions. And
by this virtue He knows when will I do well and when will I do badly. When
my will power will sustain and when will it cave in. If this were the case
where is the room for free will? My free will is like the free will of a
child who sits in the toy car of a merry-go-round. He thinks he is driving
the car; making it go faster or slower but actually has absolutely no role
to play. My thinking that my actions will give me good or bad results is a
folly as one one omniscient power would know the outcome even before I have
decided to perform the action.
If this be the case why did all the sages, saints, prophets and the learned
ones not tell us the fallacy of free will. Or was this that they wanted to
communicate when they preached to just keep doing the actions and not worry
about the results. Since I have no role to play in the results of my actions
I should stop bothering and just keep doing what I wish. In fact what I
think is my wish, is also known to Him and was destined to happen and so is
not my wish at all.