The US was a Christian nation. We had state religions, religious tests for office, and state funding and promotion of religion. This was all true under our current constitution. Eventually the courts invented the idea this was unconstitutional. That is preposterous since many of the original states had all the things they say are unconstitutional.
There is no such thing as a country without a religion. Some sort of philosophy will be imposed on people. The issue is how free are dissidents.
Currently the religion imposed on people is secular humanism. It is Christianity without Christ. At the same time the state is really anti-Christian. This is shown in the various attempts to remove prayer from public life, and abortion and homosexuality being imposed on people.
So to answer your question, yes, we should return to our roots and once again be a Christian nation.