Yes, it is the duty of Christian churches to organize protest marches against Gay Pride marches in their city, which make their city into Sodom and Gomorrah.
What is important to God must be important to the Christian churches. It is important to God to illegalize homosexuality in society.
The Holy Bible is clear that homosexuality is a crime far more evil than murder. Every Christian church has a moral obligation before God to oppose Gay Pride marches and work to ban them in their cities.
Every Christian church should push their US Congressman to illegalize homosexuality by national law. This is absolutely necessary as required by God’s Law. God expects every nation to illegalize homosexuality, and God will punish nations that do not illegalize homosexuality in His own special way.