The governments who call themselves jewish, fund and endorse the preservation of churches, which are avodah zorah 100 percent.
Many of the churches are owned by someone else especially the Armenian church who owns alot of the land in israel (and interesting enough the land where the Knesset is built on)
The christian tourists provide alot of jobs, like it or not, its needed income especially for Jerusalem which is a poor city and not many economic opportunities outside of tourism (Tel Aviv has alot more economic opportunity)