Sure you can ask anyone if the founders were Christian, if they have been in school in the last 10 years they likely will tell you they were deists, and we are not and have never been a Christian Nation
“Those who control the present, control the past and those who control the past control the future.” - George OrwellWe have given lip-service to being a Christian nation but have stopped bothering. Most of what passes for Christianity today is near paganism.