I think If you say, "We have been going to the church (regularly) since that day or since, say, 20th of Nov, 2012" , It's clear that when you started to go to or to attend the church, It's clear that you still go to the church. ".
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tamguatlayFrom that day on, we started attending the church. From that day on, we have been attending the church.You don't need commas.