JS, I agree, there are materials developed for Sunday School and home schooling that is religion based and not something that I want to teach my great-grandchildren. Here is some basic information:
Science skills for kids: 5-6
A five-year old is able to understand patterns of life, i.e. seasons of planting, growing, harvesting, preserving foods for winter. Growing a garden is the obvious practical project. Or, learning patterns of stars by seasons. There are times to see different stars and constellations. Good sources include:
National Geographic Kids First Big Book of Space (First Big Books) ...
Color patterns intrigue small children. You might try:
There should be more, and I will look tomorrow.
The video below I made when my 11 year old boy and I were talking about academic honesty.