I dunno how much help I will be since mine are only 5, 3, and 1 (and one on the way), but…
My five year-old son is definitely interested in the faith. We have been homeschooling him using a Catholic program, though (www.chcweb.com) which I think has made a HUGE difference. The Faith permeates everything he does, school-wise. We talk frequently about God and things to do with the faith, he likes to read his Bible (it is also part of his schooling), he enjoys learning about saints, etc. The homeschooling program has recommendations for crafts, games, feast days, pretty much everything- to make our family like truly reflective of the Church in a very gentle way.
Even if you choose not to homeschool, there are a lot of good materials available for family life out there. CHC (from the link above) has the book “A Year with God” which has tons of ideas for things to do throughout the liturgical year as a family. We also really like the “Devotional Stories for Little Folks” books 1 and 2 as nice, short stories about other kids in similar situations to our own kids who learn morals and lessons about the faith. Sometimes they give us a nice starting point or a place to refer back to when we have a conversation with our son.
We pray as a family everyday at meals and before bed, and either together or separately in the morning.
We only attend Mass on Sundays because of the distance we’d have to drive to the parish, but we will occasionally go to a daily Mass and adoration, and we will occasionally take our 5 year old as a big boy thing to do with Mom or Dad.
We try to be good examples to our kids on striving for holiness, too. Try being the operative word there. We also discuss openly with our kids our own prayer life (like praying the rosary or the liturgy of the hours), our need to frequent the sacraments of confession and Holy Eucharist, our love for Our Lord and Our Lady, etc.
So the best advice I have is not to be pushy, but just try to let the faith slowly permeate everything you do and everything your son is exposed to. We have talked about secular shows and stuff in light of the Faith with our son, as well. It’s okay for them to have other interests and not to banish them or show them that it annoys you for them to like things that are morally neutral and age appropriate (as I write this my two sons are upstairs watching the Transformers animated show). Just try to keep things in perspective for them. Ask questions about what they think about the actions of the characters in their shows, and give your opinion as well.
Anyway, I feel like I am rambling. I hope this helps!