Its good to know that you used to live a christian life. Those questions you have in mind are implications that you need something. Your soul is looking for it and that you don't know what it is. If you believe that human consist of body, spirit, and soul, you also believe that a human soul needed to be satisfied to complete yourself.

It's alright for a person to be asking the questions you have right now because it only means that you are seeking for happiness, a real happiness.