When we become Christians, we take responsibility for our behavior by the strength of God's Spirit.

There are four kinds of behavior.
1.  Reflex behavior.  You can't control these.  If a doctor taps your knee with a rubber hammer, your leg will move.   You have no control over it.
2.  Drives.  These behaviors insure the survival of the species.  We can control them to a point, but they are always there; they fight against us for resolution.  Hunger, thirst, sex.
3.  Instincts.  The definition is:  "A genetically transferred pattern of behavior that, when stimulated, will present itself full blown.  It is not learned, and occurs without exception in the species."  An example: the Monarch butterfly.  The male and female fly North from S. America, lay eggs and die.  The young hatch, and fly back to the exact place in S. America that their parents were from, without ever having been there.  Sea turtles do the same thing.
4.  Controlled behavior.  All other behaviors are ones that we control.  We want to excuse ourselves by saying that we were born that way.  We can't help ourselves.  But that isn't true.  We do what we choose to do.  We can control ourselves.

Scientifically, humans have no instincts.  You may think you know one, but look at the definition: "Occurs without exception."  But, as a  Christian, I think that there is one.  Only humans look for something outside of themselves.  They search for God.  They make idols.  A Tiki.  A totem.  They worship the sun, the moon, the stars, cows (in India), fire, rain, etc. 

Personally, I believe we have one instinct.  When God created man, He created a place within man that yearns for Him.  "He breathed into Adam a living soul."  The breath, Spirit, of God took up residence in Adam.  But man ruined it, and since that time we are born "dead" in trespasses and sin.  Empty. (Ephesians 2:1)  And that empty place within us searches for fulfillment.  For meaning.  But the only thing that will satisfy your longing is God.  "Christ in you, the hope of glory."  Filling up the empty place.