Romans 2:14-16:
When Gentiles, who do not possess the law, do instinctively what the law requires, these, though not having the law, are a law to themselves. They show that what the law requires is written on their hearts, to which their own conscience also bears witness; and their conflicting thoughts will accuse or perhaps excuse them on the day when, according to my gospel, God, through Jesus Christ, will judge the secret thoughts of all.
These verses do
not say that human conscience reveals God. The context says that even people who do not know God naturally have a sense of morality -- something that I have seen some fundamentalists deny.
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