God's laws against pagan practices, and prohibitions against idolatry and strange worship, do not just mean worship of other gods, but worship in a way that seems to be right in our own hearts and not in the way that He commanded. From the perspective of people who did not grow up in the truth and grew up in "Christian" households, we see that they did not set out to worship the true God in an unholy manner, but that because of tradition, worldly culture, and traditional instructors of the Bible, they followed God in ways that He did not approve. Deuteronomy 12:30-32 instructs us what type of worship is expected of the followers of Christ and says that we should not add or subtract based on what we feel should be our own input and feelings. We should never look to worldly examples for their forms of how they worship their gods to apply to the One. God does not have a specific word for "pagan," but all forms of inappropriate worship are equivalent to paganism. The Nadab and Abihu story in Leviticus did not analyze their intent but the judgement was just as harsh no matter what their motives were. We are to walk in the way that Christ wants us to and not in the way the world wants to walk with Christ.