This study examined the influence of mother-child interactions on preschoolers' externalizing behaviors in Christian households through the mediating effect of communication. 354 young children from Christian families were analyzed using the 7th wave of the Panel Study on Korean Children (PSKC). The data were analyzed using SPSS 21.0 and AMOS 20.0, and structural equation modeling was applied. The results showed that mother-child interactions influenced young children's communication, which in turn had a significant effect on externalizing behaviors. These findings suggest that as mother-child interactions become more active, children's communication skills improve, leading to a reduction in externalizing behavior problems. Also, the direct effect was significant, indicating that mother-child interactions play a crucial role in mitigating externalizing problems. To prevent young children's externalizing problem behaviors within Christian households, it is important to foster maternal interaction based on Christian values and faith. This can lead preschoolers to develop an appropriate understanding of social situations and express their intentions effectively. The importance of maternal interaction and communication from a Christian perspective was emphasized, and various interventions were discussed.