The church's power started to decline in the renaissance because,the people started leaving the church to focus more on humanism.
To study HUMANISM forget the church
Where are you guys going?
Yeah what she said!
The church improved again and gained power in the church reform because you needed salvation of it was believed you'd suffer in the after life, and you couldn't get salvation unless you followed the church's rules
You obeyed our rules and went against our god, you know what that means
No please i'm sorry! I'll do anything, I'll do whatever you want
The church started to slowly lose power again in the scientific revolution because the church's views and theories was challenged by Galileo and Nicoloause