There is a difference between "service to God" and "spirituality"?
i guess it depends on how you define spirituality...
Definition of SPIRITUALITY
1: something that in ecclesiastical law belongs to the church or to a cleric as such
2: clergy
3: sensitivity or attachment to religious values
4: the quality or state of being spiritual
which definition are you referring to?
Even if we are to go with your understanding of "religion" (ie. 'institution', 'organized religion'), it's still not clear how one can have spiritual experiences that are separated from religion, what to speak of making spiritual progress.
if you take religion as a whole, you could say that about any experience, not just spiritual ones. i suppose that the majority of religions would describe all experience as spiritual, whether you recognize that or not, because you are a spirit, and there are spirits, and we are spiritually influenced, again, whether you recognize that or not.
it all comes down to whether you're being led by the spirit or by men who tell you what to do. which one are you seeking, because you can't serve both. the spirit doesn't tell you what to do as men do. the spirit changes you from the inside out, through interaction. that's what i call spiritual experience. it leads you to repentence, not out of fear, not of approval seeking, but out of understanding through experience. therefore, you can not rely on others to give you this understanding. you can't really know something without experiencing it. you can know about it, but it doesn't even seem like you're paying attention to that.
can you remember jesus ever having anything good to say about the religious people of his time? ever patting the on the back and saying, "you're doing a great job?" no. never. all he ever did was criticize and correct them. when he said to them, "you are the teachers, and you don't know this?", i think this was probably his expression...
and that conversation (with nicodemus) was about the EXACT SAME THING i and others are trying to explain to you right now.
you know how, according to the bible, the spirit is supposed to accomplish a work in you. in my experience that work had much to do with the annihilation of my fear and ego. you can't repent if you're afraid of what other people will think of you, and you can't repent if you're ego is in the way. it seems like you're so afraid of being wrong that you're paralyzed. and the first thing god's going to show you, and continue to show you, is how wrong you are all the time, and you will have to learn to be ok with that, and you will when you realize that god loves you anyway, and you'll learn to love yourself anyway, and you'll learn to love others anyway, and it will change you and your life.