Why am I a Christian today? Luther’s Small Catechism from the Third Article of the Creed answers this one for me.
“I believe that by my own understanding or strength I cannot believe in Jesus Christ as my Lord or come to him, but instead the Holy Spirit has called me through the gospel, enlightened me with his gifts, made me holy and kept me in the true faith, just as he calls, gathers, enlightens, and makes holy the whole Christian church on earth and keeps it with Jesus Christ in the one common true faith. Daily in this Christian church the Holy Spirit abundantly forgives all sins—mine and those of all believers. On the Last Day the Holy Spirit will raise me and all the dead and will give to me and all believers in Christ eternal life. This is most certainly true.”
This is how I understand the theology behind this. The Holy Spirit unites me to Christ independent of any cooperation from my unrenewed human nature. This means that only God can illuminate my understanding of his word so that I can believe. It is only God who enables me to see God’s excellence and unsurpassing beauty. Due to my human nature, it is impossible for me to come to Christ on my own, no matter how hard I may try. My own hardened resistance and stubbornness wants to do everything on my own without God; but it is only by the power of the Holy Spirit who regenerates me so that I am born again.
Do you believe you came to Christ on your own power? Why are you a Christian today?