Don’t you make up your own mind for everything?
Of course, but when it comes to dedicating your life to serving some deity, it's based on something more than a few arbitrary lines in a book that were written by people who never met the people they claim to be quoting.
Gee... when you say it that way it kind of sounds crazy. However when I say it my way it doesn't.
You use the phrase "some deity" rather loosely. Like it implies that it is less than it is. Maybe the problem here is one of perception. Since you have never seriously considered what this "some deity" might be, you have never placed this "some deity" in its proper context. My perception of God is that God is not like us. God isn't made up of matter and energy like us. In fact there is no thing that can describe God because God is no thing. The closest I can come to perceiving God is that God is consciousness without form.
I also liked your phrase "a few arbitrary lines in a book written by people who never met the people they claim to be quoting." This too shows that you have never given any serious consideration to it. The Bible is actually a very complex Book. Different literary styles - such as allegorical, poetic, wisdom, historical, law, prophetic,etc - are used throughout the text. My guess is that you intentionally seek the worst possible understanding and then look no further. In its simplest form the Bible tells us that God created existence, man is a product of that creation, that everything that was created is good and that man should go forth and be fruitful. This account was passed down for thousands of years by ancient man before it was recorded by Moses. Just as the Chinese used well known history and everyday things as symbols in their written language to make words easier to remember, ancient man used stories to pass down historical events and important knowledge to future generations. Interspersed in these allegorical accounts of history are wisdoms that they deemed important enough to pass down and remember. Such as man knows right from wrong and when he violates it, rather than abandoning the concept of right and wrong he rationalizes he didn't do wrong.
So the lines in the Book are really not arbitrary at all. The bible is effectively a how to book; how to live life and how not to live life.
As to your phrase "dedicating one's life..." again I think there is a problem of perception. I believe you think it means one thing whereas the people you are placing this perception upon see it an entirely different way. The original meaning and practice of the word worship has been lost through 6000 years of time. Worship is nothing more or less than giving praise and thanks. We give praise and thanks by what we do, not by what we say. We show our praise and thanks in how we live our daily lives; how we conduct ourselves in every endeavor and transaction; how we do the little things; how everything we do is done like it is a sacred act in appreciation of all that has been given to us. The Bible tells us that we are to do as the original worker did - create for 6 days and then rest. We had to be told to take a day off from creating because creating is supposed to be fun. We are happiest when we are using our talents to create. There is no better way to show one's appreciation for what he was given than by using it. That is what dedicate means to me.