Just an example for our state. The gov't spent an estimated 100,000 on the purchase, care and protection of a Christmas tree this year. And the governor had his gatherings/worship and photo ops in front of it. Nothing was spent on symbols of other religions, or rational non belief expressions of ideology.
To me this seems like trying to establish a state religion to the exclusion of other faiths and non faiths.
No matter how I feel about my own personal celebration and enjoyment of my own Christmas tree, it doesn't seem right to impose on others from the top down by the government that way.