In Arizona there was a TV news about a church being sold after years in the Phoenix valley. It was sold to a developer. I immediately started to pray for that church. Then a thought went through my mind to look up the church. I found their website. This is a beautiful church in one of the wealthiest towns in Arizona. I started to read the statement of the change to the church and found at the bottom of the page a rainbow flag. Yep, they let in a bad spirit of faith. There was also a pentagon in one of the stainglass windows when it was built. I took that as an omen. Their reasons for the selling of the property were excuses of older generation, cost upkeep, etc. But they did not grow because the faith must have changed. You can read for yourselves and see the website: Ascension Lutheran Church www.alcpv.org
I believe God is cleaning up the church to keep it pure. What do you think?
Oh, but to answer your title question... yes, judgement begins at the House of God.
Not sure. Here is something about the Church Solution Company. It seems to be a company that helps Churches with online technology. The flag you mentioned would be the choice of the website designer of the Lutheran Church.
https://www.churchsolutionsco.com/about-us.html