They describe what people are searching for through spirituality. Buddhism's way is a list of guidelines called The Eight-fold Path. Islam's truth is the Qur'an, which grants Jesus only a bit part. Behind His exclusive declaration that other religions cannot save lost people, there stands a latent promise. When the people you and I witness to approach the Father through Jesus, the Gospel surely delivers what it offers.
People finally obtain their goal.
Fellowship with their heavenly Father is restored to them through faith in the crucified and risen Savior. So don't be ashamed to lift Christ up.