I'm sorry to hear that you have lost your dad. 
I have never been to a secular funeral, but what you described sounds like a good way to remember your father. Getting friends and family to recount stories of your dad is a great way to remind everybody about the good times and the type of person he was. You're on the right path with that idea. You could also speak to a Unitarian Universalist minister about officiating and see what you think. The ones I am familiar with are intelligent, thoughtful people that would speak about the preciousness of life and such without forcing a dogmatic message that takes the focus off of the deceased and heaps praise on gawd/lord jeebus.
Again, my condolences.

I have never been to a secular funeral, but what you described sounds like a good way to remember your father. Getting friends and family to recount stories of your dad is a great way to remind everybody about the good times and the type of person he was. You're on the right path with that idea. You could also speak to a Unitarian Universalist minister about officiating and see what you think. The ones I am familiar with are intelligent, thoughtful people that would speak about the preciousness of life and such without forcing a dogmatic message that takes the focus off of the deceased and heaps praise on gawd/lord jeebus.
Again, my condolences.
"We are all born ignorant, but one must work hard to remain stupid." ~ Benjamin Franklin