If I'm not important to god, then why the hell should I offer worship to him?
Worship implies a need in god to be worshipped. Worship belies a basic insecurity in god's personality, or even worse, a selfish motive in creating creations for the sole purpose of offering him worship. If all creations (other than humankind) glorify god by their mere existence, why is more - i.e., worship - expected of humankind?
It's like a woman who keeps having children for the sole purpose of having offspring to adore her. She has them, not to contribute to their well-being, but for them to fulfill a desire to have a purpose in herlife, rather than seek fulfillment in other ways that don't require "adoration" from her offspring.