I work at a non-profit nature center. They offer classes all year round for kids K-12, and 8 week long weekly classes for toddlers. These are field trip type classes, so the kids are still in assorted schools. I’ve seen public and private classes take advantage of the programs.
They also offer in the summer, week long summer camps for the neighborhood kids. No overnight stuff.
The big summertime push though is 3 weeks in August. It is called summer reading camp. Here the kids read or are read to out of all kinds of nature related books. Some of those books classify in my opinion as indoctrinational. The reading camp is done by adult volunteers.
Here is the thought...we need to start smallish. Perhaps finding someone to take on a neighborhood afterschool program of reading, creationism, arts, etc. Books and such could be loaned or donated. Perhaps a church would be willing to host such activities as interdenominational. Advertise in church bulletins.
A nonprofit could be established to help forward this agenda.
A good idea, but I would start with a non-political non-religious topic, American History, aimed at the same audiences. It sounds non-threatening, but it will plant seeds in the minds of these future voters of the way America should be.