The prayer in Matt 6:9 is to God the Father in heaven, not to a confessor which is considered a sacrament in the RCC since the 7th century, simply because they want to worship the authority of their church more than faith alone in Christ alone.
Eph 5:20 also stresses this point. The prayer is to God the Father through faith in Christ, not through faith in the authority of the RCC.
Now here is some wisdom. Just as we observe those who probably at sometime are believers, but have such a scarred soul, that they place Christ second to the authority of their church, thinking they are behaving properly and righteously by their own reasoning,...and just as the same thinking is used by many Judiazers, arguing well from their Scriptural studies, but turning away from Christ when presented directly to them,...likewise, we also will likely encounter similar temptations in the Millennium Reign.
The human condition is so scarred that it will take millennia to sort it out, for us to perform as He intended for us think, act, will, and remain in fellowship in all things.
The age of grace will be over before the Millennium. The church will leave this earth before the seven year tribulation begins. After that it will be Christ ruling and Satan will be bound for the time and he will have no influence.