Colossians 1:21-23 is another passage (along with 1 John 1:9) that I heard quoted as supporting the idea that as we do or don’t do something, it causes God to do or not do something in response. The “if-then” construction is what throws people off. To be sure, it’s hard to translate properly into English.
However, the “if I am doing something – then God will be doing something in response” (my cause and God’s effect) workflow is not the workflow of grace, and it’s not supported by the grammar of the passage, as I will demonstrate below. Grace is God providing something through the finished work of Christ on the cross, 1900+ years before I was even born; faith is me appropriating whatever was provided by grace, as applicable to a given situation in my life. So it’s not “If I am doing X -> then God will do Y”. It’s rather “God has done Y and made it available -> therefore as I am trusting in it as being applicable to my life, I am thereby realizing Y’s benefits in my life.” Notice how concerning my side of the equation, the focus is on believing / trusting. Concerning my words and actions as related to Y – the correct stance should be “My words / actions X demonstrate that I believe Y”. In other words, “God has done Y -> I trust in and stand on Y (as shown in my words and actions X) -> Y will materialize in my life” That’s the correct workflow.
So the effect portion of the “cause-and-effect” pattern is not about God objectively doing something, but about me subjectively appropriating what’s already been done. The cause doesn’t affect God, it affects me. God did all he needed to do 2000 years ago. The grammar here is similar (not the same, but similar in all main points but one) and follows the same basic logic as 1 John 1:9, which is also largely misunderstood and misapplied.