This study focuses on the concept of salvation by grace as taught in Romans 3:23-26 and its relevance to the understanding of the GKPPD congregation today. Through a literature review with a theological approach, it was found that the doctrine of salvation by grace is the core of Christian teaching. In this passage, the Apostle Paul explains that all humans have sinned and fallen short of the glory of God (Romans 3:23). However, salvation is given through redemption in Christ Jesus, not as a result of human effort, but as a gift of God alone (Romans 3:24). Salvation is given through faith in the blood of Christ which redeems and takes away sin (Romans 3:25). In the context of the congregation today, the understanding of salvation by grace remains relevant. Many GKPPD congregations are still trapped in trying to obtain salvation through or obedience to the law, even though Romans 3:23-26 emphasizes the importance of faith in Christ's redemptive work. This study highlights that teaching about God's grace should foster a sense of gratitude, humility, and commitment to living in faith, not in fear or legalism. This study confirms that the concept of salvation through grace is the center of Christian faith teachings that need to continue to be lived and conveyed in the lives of the GKPPD congregation today and increase theological knowledge about the concept of salvation and can be a reference for theology students and reading materials in the IAKN Tarutung library.

The research background is related to inter-ethnic marriages carried out by couples with different linguistic and cultural backgrounds, namely the Batak and Nias Adanva ethnicities. Differences in different linguistic and cultural backgrounds result in differences in interpreting and understanding the message or information conveyed, this can giving rise to misunderstandings. This research was conducted in Hutagodang Village, Kec. Batang Toru. South Tapanuli Regency.The main problem in this research is the description of intercultural communication and communication barriers between inter-ethnic marriage couples in Hutagodang Village. This research aims to find out and explain how intercultural communication in inter-ethnic marriage couples and what communication barriers occur in inter-ethnic marriage couples.