Sufficient evidence having been provided, we must conclude that conscience morals are not innate. They, the majority of these morals at least, have been formed and created according to the nature of the human’s surrounding influences.
However, we do know from Romans 2, that to some extent every conscience is alike. For when the Gentiles which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: Which shew the work of the law written in their hearts, their conscience also bearing witness,…Yet, if we are to assume that there are certain base morals at the heart of every conscience, the question must needs be asked “What are these morals?” We could naturally assume from the above verses that they are God’s law: the ten commandments. But how can this be, when certain remote tribes have held such heathen glories? Human sacrifice, collecting scalps, deforming children, etc. No this isn’t just a case of man so deep in their sin that they’ve turned off God: even the smallest and most innocent child has never questioned this tradition.
Without condemning either scripture or logic, I find only one explanatory answer: there is indeed in every man a light (Jhn. 1:9, Rm. 1:20), but it is not until he uses certain of his God-given faculties in the mind that he will recognize this light. This light has no meaning and will effect nothing, until it has been discovered. Then once it has been discovered and inquired into, it will then lead further to a brighter light, and so on, until the soul in whom it dwells has understanding of God and his master plan.
Now I reckon the most needful question to be asked would be; should we follow our conscience blindly, regarding it as a divine voice? If we believe it’s morals have been formed from upbringing and society then most assuredly not. Yet we must agree that God did not   such a complex structure inside of us simply for our amusement. May I suggest a proposition? Bearing in mind Heb 9:14  “How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?”  could it be that maybe at our time of salvation, God rids our conscience of it’s man-based morals and in their place engraves His own law?
Still though, this does not fit it so well as to leave no room for opossums. Didn’t we already conclude that all consciences are not alike, even for the christian? We find in I Cor. that the brethren’s consciences vary in degree of strength and weakness.  Would this degree of conscience simply be paralleling their level of spirituality – their growth in the Lord?

Does this leave us to unquestioningly follow our own conscience?