Malachi Martin was relieved of his vows of obediance to the Jesuit order by Paul VI to pursue documentation of the upcoming events of Vatican II.
Just how bad did Martin judge things to be? Extremely so, even if his traditionalist viewpoint saw little difference between homosexuality and pedophilia, neopaganism and satanism:

Suddenly it became unarguable that now during this papacy, the Roman Catholic organization carried a permanent presence of clerics who worshipped Satan and liked it; of bishops and priests who sodomized boys and each other; of nuns who performed the "Black Rites" of Wicca, and who lived in lesbian relationships.. . . every day, including Sundays and Holy Days, acts of heresy and blasphemy and outrage and indifference were committed and permitted at holy Altars by men who had been called to be priests. Sacrilegious actions and rites were not only performed on Christ's Altars, but had the connivance or at least the tacit permission of certain Cardinals, archbishops, and bishops. . . In total number they were a minority — anything from one to ten percent of Church personnel. But of that minority, many occupied astoundingly high positions or rank.

. . .The facts that brought the Pope to a new level of suffering were mainly two: The systematic organizational links — the network, in other words — that had been established between certain clerical homosexual groups and Satanist covens. And the inordinate power and influence of that network.
(pp. 492-3. Emphasis added)

Yet his first hint of any diabolic activity there comes towards the end of "The Decline and Fall of the Roman Church "(1981), a history book that sets out his worldview and concerns of the Faustian bargain with temporal power that the Roman Church made seventeen centuries ago and its corrupting effects ever since. It occurs with his first mention of that ominous saying attributed to Paul VI:

Paul realized in his last two years that something unimaginably ominous had been moving inexorably toward them, was already in their midst, and had nothing to do with the Holy Spirit. "The smoke of Satan has entered the church, is around the altar," he remarked somberly. By 1978 and in the last few weeks of his own life, Paul knew that the rumbling tension of his world had grown to the a roaring, and that around him there was a conflagration feeding on the dry wood and the underbrush of the centuries-old kingdom. (p. 278, emphasis added