This research was conducted to offer basic education tools for Christianity by developing a faith maturity index in the aspect of educational ministry. The summaries of the results are described as follows. (1) In term of educational ministry, the faith maturity means dynamic integration between centrifugal areas and centripetal factors. The centrifugal areas mean koinonia, kerygma, didache, leiturgia, and diakonia. The centripetal factors mean membership, ministry, mission, and mystery. (2) The centrifugal areas and centripetal factors were specially considered while making items. Based on the previous researches that were conducted, the items could be responded according to the 5 point Likert scale. Based on the pilot testings that was done two times, 9 different items each for 5 different areas were made (basically 45 items were made). In order to test the propriety and the reliability of the paper, 357 adult christian from the churches and educational institutions such as schools in many different areas of Korea were selected as research objects. Technically, SPSS WIN 12.0 program was used to do statistical analysis, reliability and validity analyses, multi regression analysis. In addition, AMOS 4.01 program's structural form equation method was used to make up for the weak points of the regression analysis. (3) The maturity index that was developed in this research had .94 in terms of cronbach's α coefficients, while the coefficents of koinonia, kerygma, didache, leiturgia, and diakonia had .74, .83,. 78, .75, and .68 respectively. the results obtained from the research was satisfactory, such indexes could serve as a useful tool for measuring christian's faith maturity and helping people out regarding that field. (4) After running a correlation analysis between background variables and faith maturities, some of the facts that could be useful to educational ministry were confirmed. They are described as follows. 1) In the faith maturity areas, diakonia was strongly related to ages, and by looking at such results, we could assume that the church education system should focus more on helping teenagers recognize and fully practice Diakonia. 2) Koinonia seemed to be less related to the jobs, and this means that churches should put more emphasis on the people who are trying to take layperson leaders in churches to fully understand the idea of koinonia. 3) It was found that kerygma, leiturgia, and ministers were more strongly related with each other compared to the relation between koinonia, didache, diakonia, and ministers. After all, it is safe to suggest ministers to put more emphasis on the areas of koinonia, didache, and diakonia. 4) Regarding the gender, koinonia, and diakonia seem to be less related. This suggests that males tend to have less knowledges in those areas compared to females, and there needs to be some improvements. (5) Reviously-made faith maturity indexes were made based on the cognitive, emotional, and behaviors, which made it hard for christians to apply to the field of church ministries. However, the indexes in this research specified areas of maturity, which means that the believers can find out their weak points of their faith maturity and fix them. (6) The research samples in this research were composed mainly of christians who are adults (above age of 18). Knowing that educational ministry should also put it's ideas on the young people, further research should be done also on children and teenagers.