Why You define your self as Non-denominational?

I grew up in the Lutheran Church. My mother (thanks be to God) made sure I participated in services until I was on my own. After that, I seldom had a desire to attend Church for about 15 years. Later on, in my military career, I became friends with a non-denominational Christian. On deployments to other countries, we attended services of various denominations, which was fun. Later on, I married my wife who is a Roman Catholic. For a while we attended Baptist services, but my wife was adamant about her Catholicism so, not wanting to confuse or discourage our kids, we attended Catholic services. I grew up in an Italian neighborhood, so I was quite comfortable with Catholics. Today, I still attend Mass with my wife, but technically I'm anathema. I don't believe in Papal Infallibility, especially with the current Pope who is of the Jesuit Order, with a history of socialist leanings. I don't say the rosary, which is supposedly a meditation, but commonly expressed as, "to pray the rosary". The Bible forbids prayer in "useless repitition". I don't believe in purgatory or indulgences. As the Eucharist goes, I see it as a remembrance, a memorial to Christ's work on the cross, but not as a literal presence. Christ's one-time sacrifice long ago was sufficient and we don't need to re-crucify Christ every Sunday. What I do like about the Catholic Church is the liturgical structure, emphasis on family and pro-life stance.
I like the basic concept of Non-Denominationalism and regard my relationship with Christ as personal. Services in Non-Denominational Churches can vary widely, though. Some have great services based on Scripture, missions and outreach programs. Conversely, one I went to had a pastor sitting on a stool just rambling on in circles, followed by a rock band.

I'm not necessarily against denominations, and think it's actually probably a good idea. All of them need reform in one way or another, based on what the faith actually was in the 1st century. So far I haven't found a particular Church I want to join, but I'm still looking, visiting and looking for a sign - that's why I'm non-denominational as of yet.

Because denominations are man made.
We each serve different functions within the body, but there is ONE Body.
Denominations are divisive.
One man becomes convinced his church..be they Baptists etc are doing it right, so to another man. And we squabble over the different functions we've been given...
We're given according to our faith as a child of God believes the Lord will use them as he did his first disciples be assured he absolutely will.