Do you need to cook a casserole with raw eggs before you freeze it?
This is absolutely fine, especially if the eggs are pasteurised. I've seen plenty of recipes that have raw egg in them that say it;s fine to freeze them. You can even freeze eggs (that have been mixed up a little) for up to three months. So yes, I'd say freeze it as soon as possible. Also, if you were concerned about freezing the quinoa that will fine as well (a lot of people don't know you can store grains in the freezer). 

Enjoy!