The thing that was found unconstitutional was inducing children to say "under God" in the context of a govornment institution.
You can say it all you want. You can make your kids say it. You can say it in church. You can paint it in big letters on your house.
The "under God" stuff isn't unconstitutional. It's the govornment employed authority figure making kids say it that is.
If words mean anything, if "God" means anything beyond general niceness, "one Nation under God" is a very powerful political statement.