The struggle between religion and irreligion has existed in the world in all ages; and if there be two opposite interests which divide its inhabitants, the kingdom of Satan and the kingdom of God, it is reasonable to expect that the contest will continue till one of them be exterminated. The peaceful nature of Christianity does not require that we should make peace with its adversaries, or cease to repel their attacks, or even that we should act merely on the defensive. On the contrary, we are required to make use of those weapons of the Divine warfare with which we are furnished, for the pulling down of strong holds, casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ.
The opposition of the present age has not been confined to the less important points of Christianity, nor even to its first principles: Christianity itself is treated as an imposture. The same things, it is true, have been advanced, and as frequently repelled, in former ages; but the adversaries of the gospel of late, encouraged it should seem by the temper of the times, have renewed the attack with redoubled vigour. . . . One thing which has contributed to the advantage of infidelity, is the height to which political disputes have arisen, and the degree in which they have interested the passions and prejudices of mankind. Those who favour the sentiments of a set of men in one thing, will be in danger of thinking favourably of them in others; at least, they will not be apt to view them in so ill a light, as if they had been advanced by persons of different sentiments in other things as well as in religion. It is true, there may be nothing more friendly to infidelity in the nature of one political system than another; nothing that can justify professing Christians in accusing one another merely on account of a difference of this kind, of favouring the interest of atheism and irreligion: nevertheless it becomes those who think favourably of the political principles of infidels to take heed, lest they be insensibly drawn away to think lightly of religion. All the nations of the earth, and all the disputes on the best or worst modes of government, compared with this, are less than nothing and vanity.
To this it may be added, that the eagerness with which men engage in political disputes, take which side they may, is unfavourable to a zealous adherence to the gospel. Any mere worldly object, if it become the principal thing which occupies our thoughts and affections, will weaken our attachment to religion; and if once we become cool and indifferent to this, we are in the high road to infidelity. There are cases, no doubt, relating to civil government, in which it is our duty to act, and that with firmness; but to make such things the chief object of our attention, or the principal topic of our conversation, is both sinful and injurious. Many a promising character in the religious world has, by these things, been utterly ruined.
Excerpt: Andrew Fuller, The Gospel Its Own Witness; or, The Holy Nature and Diving Harmony of the Christian Religion Contrasted with the Immorality and Absurdity of Deism.
Fuller, A. G. (1988). The Complete Works of Andrew Fuller: Controversial Publications. (J. Belcher, Ed.) (Vol. 2, pp. 3–4). Harrisonburg, VA: Sprinkle Publications.