The bizarre case of establishment serving "Christians"

One thing I find bizarre is people who claim to be Christians and yet have sold their soul to the devil by promoting the various evil agendas of the establishment. I realise many of these people are career liars but there seems to be some who actually believe that they can serve Satan and still be a Christian. Bizarre. You can't be pro-establishment and be a Christian. It's just not possible. That's unless you are incredibly stupid. Then anything is possible, in the mind of the deeply deluded. But what of the seemingly intelligent ones? What in heaven's name is going on there? Just good liars or instead in deep denial of what they are actually doing and who they are actually serving? I just wonder what mental gymnastics such folks engage in. It makes no sense to me.