1 Cor 3:1-9
3:1 And I, brethren, could not speak to you as to spiritual men, but as to men of flesh, as to babes in Christ. 2 I gave you milk to drink, not solid food; for you were not yet able to receive it. Indeed, even now you are not yet able, 3 for you are still fleshly. For since there is jealousy and strife among you, are you not fleshly, and are you not walking like mere men? 4 For when one says, "I am of Paul," and another, "I am of Apollos," are you not mere men? 5 What then is Apollos? And what is Paul? Servants through whom you believed, even as the Lord gave opportunity to each one. 6 I planted, Apollos watered, but God was causing the growth. 7 So then neither the one who plants nor the one who waters is anything, but God who causes the growth. 8 Now he who plants and he who waters are one; but each will receive his own reward according to his own labor. 9 For we are God's fellow workers; you are God's field, God's building. NAS
Rom 2:3-4
4 Or do you think lightly of the riches of His kindness and forbearance and patience, not knowing that the kindness of God leads you to repentance? NAS
2 Tim 2:24-26
24 And the Lord's bond-servant must not be quarrelsome, but be kind to all, able to teach, patient when wronged, 25 with gentleness correcting those who are in opposition, if perhaps God may grant them repentance leading to the knowledge of the truth, 26 and they may come to their senses and escape from the snare of the devil, having been held captive by him to do his will. NAS
Only God can save anyone. We can sow the seeds of truth with the hope and prayer that God will find fertile soil for what we sow. What we cannot do is market Christianity as a product by forcing Biblical principles on others.