There could be several reasons why people would be reluctant to confess and deal with their sins. It could be a pride issue. They might underestimate God’s grace and fear they’ve messed up too big to be forgiven. They could be afraid of judgement from the church. They might be embarrassed that they’ve been dealing with the same sin their entire life. If having a walk with God will cause us to deal with our sin, then the inverse is also true. When we’re unwilling to deal with our sin, it will affect our walk with God.