Here is a reference you can provide to soft target owners and operators.
The unfortunate list of shootings and other events that are happening at places of worship are likely causing the leaders of those houses of worship and other places like shopping malls or theaters to think about what their own risks are. If they come to you, you can make this reference available to them: Security of Soft Targets and Crowded Places–Resource Guide
What is good about the linked document is that each section has digital links to other references throughout, that provide additional information. I suggest you peruse this so you are familiar with its contents.
Claire Rubin, who has done work with houses of worship, shared this document with us.