The way Christianity is most often practiced in the United States (and other Western countries) today, we need the permission of the governments to continue practicing in such a way.
We depend on zoning laws for our buildings and parking lots. We depend on tax-exemptions to make our mortgage payments. We depend on 501(c)3 tax-exempt charitable donations to receive our income.
If the government stepped in and did away with just these three things, but did not make Christianity illegal, I fear that most Christian churches would fold. Western Christianity depends upon such things for survival, which means that we depend upon our government for survival.