Ego is an interaction between you and your environment, so strictly speaking it's not acquired per se - sorry to nit-pick but I think it's important enough to mention. It's an interaction between you and Life in general - the things that happen to you, the experiences you've had, your perceptions... Your reality as you have created it.

Your Spirituality comes firstly from your genes and the rest is ego, all you have to do is ask "What are the reasons I think of myself as Spiritual, what are the reasons I have these beliefs?"