In our 1 Samuel passage we see the Israelites treating the ark like a good luck charm, and God like a genie ready to grant their every wish.
Following God because of what He can do for us is not faith. Obviously, we need to rely on Him for our salvation - it was all Him. Jesus came to earth, lived a perfect life, died for our sins, rose from the dead defeating death and sin, returning to heaven and giving us His Spirit which works within our dead souls to bring us to repentance and relationship with Him. We need to put our faith in God because of who He is, loving Him, knowing Him, obeying Him.
I love how God demonstrated His power undeniably to the Philistines in the face of their worship of a false god.
Our NT passage focuses on unity within the body of Christ. We are to love each other. But unity and peace cannot come at the price of allowing sin to fester unchallenged. We are to speak the truth in love, but we're still to speak it. Peace at any cost is too high a price to pay.
Tomorrow's Bible In a Year Passage passage: 1 Samuel 7-9; Ephesians 5:1-16