It’s one thing if you engage in sin - then come before the Lord and seek forgiveness - but if one continues to sin (supporting abortion) despite what should be the conviction of the Holy Spirit - then perhaps one is not really a Christian after all.
Saying the “sinner’s prayer” or calling oneself a Christian doesn’t make it so - “by their fruits you will know them” - perhaps they have decieved themselves.
True - only God can know the heart - but again: “by their fruits you will know them”.
Fruits refer to false teachings and false prophets.