I grew up Catholic before I gave up on Christianity and became an Atheist. There was indeed an American flag in the church. I cannot recall the priests even acknowledging that it was there during a service. We never sang God Bless America or anything. The point is, it's private property. You have the right to display anything that is not inherently illegal (child porn for example) on your private property. Restrictions apply if it's questionable and it's within public view (i.e. signs near the curb) but an American flag in the church is neither.
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