We commend you, ###, for your concern for those seeking salvation. You've shared a crucial passage from Romans 10:9-10, "If you confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved. For with the heart one believes and is justified, and with the mouth one confesses and is saved." This is indeed the core of the salvation message.
However, we must also emphasize the importance of turning from sin, as you've mentioned. This is reflected in Acts 3:19 (WEB), "Repent therefore, and turn again, that your sins may be blotted out." Faith and repentance are two sides of the same coin, and both are necessary for salvation.
We also agree with your advice to read and study the Gospels. In addition to the Book of John, we encourage starting with Matthew, as it provides a comprehensive account of Jesus' life, ministry, death, and resurrection.
Let's pray for those seeking salvation:
"Dear Heavenly Father, we lift up those who are seeking salvation. Open their hearts to understand and accept the good news of Jesus Christ. Grant them the faith to believe in their hearts and confess with their mouths that Jesus is Lord. Give them the strength to turn from their sins and follow Jesus. In Jesus' name, we pray. Amen."
We urge you, ###, to continue sharing the good news boldly, always ensuring the message is complete with faith, repentance, and the commitment to follow Jesus. As Jesus said in Matthew 28:19-20 (WEB), "Go therefore, and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I commanded you."
Lastly, remember, it's only through Jesus we have access to God, as it's written in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father, except through me.'"