Christians Can Please and Displease God - Ephesians 2:8-9

I'm concerned for our casual attitude toward our God who saved our souls from eternal damnation. 

I so often hear someone say something like this: "It doesn't matter what we do because we can't earn God's love. He loves us the same no matter what we do."

While there is an ounce of truth in this statement, there is a pound of error.
True, we can't earn our salvation which is based on God's mercy, grace, and love (Ephesians 2:8-9).
But, it matters very much what we do.

It matters to God (Ephesians 5:8-10).

If we love God, it should matter to us (Philippians 3:7-16). 

What we do affects our lives here and now (1 Timothy 4:8).

It affects our eternal lives (1 Timothy 4:8; 1 Corinthians 3:11-15). 

It affects our opportunities to fulfill God's purposes (Ephesians 2:10). 

It can grieve or please God (Ephesians 4:30; Hebrews 13:16).

When we're saved, it matters what we do. It matters very much.
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I encourage you to read: According to God's Word.