this life on earth is a probational time for us it is to get a body a to prove that we are worthy of living with god again!

To compare the human state of existence as being similar to the survival instinct of animals means that we have no purpose in life other than to ensure the continuation of our existence. Why then does free will exist?

Your point is self-defeating. Free will exists, but our choices are still guided by the need to procreate (read the first point on the other side).

Free will and rational thinking exists to enable people to discover what life means specifically for them…if not, we would merely all imitate one another and react identically, as an instant survival mechanism would insist that we do just that.