Sorry, I know the definition of faith has be discussed many times.
Just trying for myself to have a concise understanding. How I would define religious faith is,
Something hoped for which can't be verified.
Right? Wrong? Is there something more to religious faith?
Worldly faith = I study and work hard, and I have faith to become worldly happy
Spiritual faith = I study and work hard, and I have faith to become spiritually happy
Both can be easily verified after hard work is done
What is the difference between being "spiritual" happy and just being happy?
I think you answered it in your reply below
I find myself preferring no expectations, that way I never have to worry about being disappointed.
IMO Spiritual "happiness" has to do with wisdom and insight to stay serene because you really know that "all is vanity", so ever changing.
"No expectations" is a good Spiritual virtue or wisdom. You can have expectations, but at least don't be attached when things go different.
So, I believe one can be Spiritual both with and without believing in God. It all has to do with transformation of attachment to Ego (which only drains energy).
So when I say worldly, I mean using the Ego to accomplish things. So Ego is not bad, it can be helpful.
When I say Spiritual, I mean "Stay detached from the above expected results". That way you become equal minded, whatever happens. And you become serene, peaceful mind and finally this "thought stream" stops. This so called "no thought state" is the ultimate peace, so real happiness. Seems simple "stop your thoughts", but takes a life long struggle to accomplish this.
Material happiness comes from acquiring
Spiritual happiness comes from detachment
Material is about "doing things"
Spiritual is about "how doing things" (introspection)
This is just my view. I hope this clarifies what I meant by "Spiritual happy". Others define "Spiritual happy" different. Spirituality is IMO your own inner Quest. It can be with or without Religion or God.