You know, there are many situation in life, when you can't just follow the logic. If so, you can say something like: "I can't see the soul, so it doesn't exist". That is pure logic, but it is not right. Also you can say: "I can't see the oxygen, so it doesn't exist too"... As same as you can't see somethings because of your eyes not able to, you can't understand somethings, that why we don't need to follow logic all the time. But as soul and oxygen, both of them exist! And that is fact.