Can a person get to contentment and security by continuing to live in apostasy and heresy?
Children of the devil have great fun partying and cursing God....until they don't.
God chastens His children..,if they are His child then they will never be at peace of they believe in heresy or actively seek sinful living because the Holy Spirit will trouble their heart and they will pray and seek God's wisdom. God will help and teach them to discern good from evil. Sound doctrine from heresy.
It is harsh and wrong to teach that God will forsake anyone who does not have perfect understanding of all scriptures and complete wisdom to discern good doctrine from man-made inventions.
We aren't perfect yet. God is sanctifying us, teaching us, making us into a godly people, but first the milk..,then the milk....first He carries us and bandages our wounds....then He teaches us to walk with Him...eventually we are strong enough to help others walk or carry their burdens of needed.
That all is done by God's grace...unmerrited favor...blessings from our Heavenly Father.