Yes!
Read some Greek mythology. How do the gods and goddesses interact with humans?
Read some of Michael Moorcock's *Elric* stories. How does *he* do it? Read Thorne Smith's "Nightlife of the Gods". How does *he* do it? Doubtlessly there are all manner of *other* science fantasies of this nature.
Since it's a SCIENCE fantasy (rather than straight fantasy) do you have a scientific explanation for your potential gods & goddesses?
Many science fiction stories have dealt with the theme of Earthmen impressing more primitive alien cultures as being gods. Many believe the gods & goddesses or *our* mythologies were really aliens from other worlds... My eldest son has suggested that Jesus was a *cross* between a human woman and an alien -- & thus he had more advanced powers -- like levitation.
How to fit them in? Obviously at least *one* of your characters (if not more than one) has to have some *interaction* with gods and a goddess -- if you're wanting to introduce them. How does that interaction come about? Why? Does he find some ancient artifact that evokes them -- or a certain concatenation of words?
There was an old Henry Kuttner story that appeared in either *Startling Stories* or *Thrilling Wonder Stories* in the first half of the 1940's entitled "A God Named Kroo" where the main character discovers the existence of the god, Kroo, and... being Kroo's *only* worshiper at that time in history, gains the *favor* of that god.
Obviously the *easiest* way is to have your character believe in & *pray* to a god or goddess (or more than one) and that god/goddess decides to intervene. What are the consequences? Does the god or goddess require an offering? Does the god feed upon the *souls* of every person the hero kills? Does the god "possess" the hero -- with unpleasant consequences? Does your hero get to make love to a real goddess -- and run afoul of a jealous *god* thereby? (or vice-versa -- your heroine makes love with a real god and his goddess *spouse* gets jealous... and turns her into a sow, or something)?
In the fantasy that *i'm* writing the (hero?) finds himself swimming in the *teardrop* of the goddess he's in love with -- looking down at her bare breasts that are as big as *mountains* compared to *his* size!
;)
the internet
Make them machine shaped.
Or make them machine minded.
Or make robot gods. Robots wonder where they came from.
There is no reason to assume that meat bags could produce real robots. Simple maschines, like a hammer or a phone yes, but an actual AI constructed by a meat bag? Ridiculous.
jplatt39
Science Fantasy really got its start in John W. Campbell Jr.'s Unknown Stories Magazine. One of the classics that came out of that magazine was A. E. Van Vogt's the Book of Ptath:
http://www.amazon.com/s/?ie=UTF8&keywords=the+book+of+ptath&tag=googhydr-20&index=aps&hvadid=31058350885&hvpos=1t1&hvexid=&hvnetw=g&hvrand=13640577016745321635&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_3gmuftgt9g_b
Buy it and read it. The hero and villainess are god and goddess.
kilroymaster
By thinking of ways to add them to your story line.......... Like I was traveling to wherever when out of no-where lighting and and bright flashes started occurring around me and the next thing that I notice I was surrounded by gods and goddess etc.............................
unknown unknowns
read some H.p. Lovecraft....Cthulhu and look up erik von daniken.