As believers we have nothing to prove to this world. It is not our job to convince others of the truth. It is our job, however, to lovingly show them the truth and allow the Holy Spirit to work in each individual’s heart to bring them into a relationship with God. Paul talks about this in Titus 3:9 But avoid foolish controversies and genealogies and arguments and quarrels about the law, because these are unprofitable and useless. Arguing with someone who does not choose to believe and see the truth is a waste of time and brings them no closer to God. We are called to do two things; love God and love others. If we focus on those two things we are obedient and help bring people closer to God.