Welcome to our faith based organization. At least that is how your stakeholders feel about the trustworthiness of data they have for making critical decisions.
You wonder why they import data you provide them into Excel and publish it as worksheets. It's because they are not sure of its vintage, accuracy or lineage.
In order to deliver value to your stakeholders you must deliver trustworthy information. Above all else, if your stakeholders do not deem the data available to them as trustworthy, then they cannot make critical decisions at the speed of business, and there is little value in what is published.