how does your theism cash out in your purposes or your behaviour ?

I feel more confidant and optimistic about the purpose of what I'm doing, so I'm more motivated and persistent. When making big decisions, I spend some time thinking about what "God" would like me to do and if I feel like there is some guidance, I'm more at peace with that decision, compared with making the decision based on other factors.

What do you do, or seek to achieve, that you would do or strive for differently if you were persuaded of Untheism?

Behavior-wise, I might act more randomly, haphazardly and hedonistically. This answer is based on a brief period in my early twenties when I lost faith in the objective existence of reality.