1. The history of actions taken by theocracies is not good. There is a strong modern social justice movement, and even saying something bad 10 years ago is enough to cancel someone. Now imagine a group that committed multiple genocides over the centuries.
2. A growing rise of "spiritual but not religious" has led young people to eschew attending church. These young people grow up and have young people of their own who are now never exposed to Christianity.
3. Relegation of religion to personal matters alone, taboo in public.
4. Christians have allowed the book of Leviticus to overwhelm their message. Because of what is said about LGBTQ, Christian == bigot in many people's minds.
I'm sure there are fellow Christians who visit HN. I think these are the primary obstacles that must be overcome in order to grow the cause. All the mission work and happy Easter messages in the world won't make a lick of difference against these 4 issues.