is soccer genetic?

At the base level, yes, genetics plays probably the most important role. 99% of the people in the world can practice with the best trainers around and never be able to break into the pros. Some of that is physical talent.  Some of that is mental dedication and understanding the game.  I've coached many kids.  Some can walk on 5-10 years behind in experience and be better than another kid who has played all his life.  

You can be blessed with certain physical gifts, but it's mainly down to the person's dedication and how much they practice. This means more than just playing, it's studying the game, keeping yourself in peak condition, eating right, making the sacrifices and of course practicing playing a lot in the right way

There are some genetic factors that can help but learning a skill is always a combination of your potential and how much you practice.