Any Christian who makes a blanket condemnation of belief in “conspiracy theories” and mocks a conspiratorial view of history is either being disingenuous or is rather dense. There have always been conspiracies throughout history and the existence of every one of them could easily have been dismissed as a mere theory before all the facts came to light.
One example of a known conspiracy is the crime syndicate we refer to as the Mafia, which at one time was believed by many to be non-existent, but now it is widely known that there are more than a few such conspiratorial criminal organizations. Another was the conspiracy of the Jesuits to overthrow Protestantism which we call the counter-Reformation. Then there was the Marxist conspiracy to take over Russia which ended in the murder of the Russian Czar and his family, and resulted in decades of Communist rule. And, of course, there is the biblically recorded conspiracy of the Jews to kill Jesus Christ. All of these have been denied at some point in history and some are still denied to this day.
And usually those who sneer at others for believing in “conspiracy theories” still accept the existence of things such as “insider trading”, “backroom deals”, “Russian collusion”, “the old boys’ club”, “institutional white supremacy”, etc. and quite predictably never call into question the existence of a German plot to exterminate the Jews, all of which belies the fact that they have their own conspiracy theories.