But he's not, actually. He's got no idea who Jesus is, which is why he aimlessly directs criticisms at Christians rather than at Jesus himself.He's presenting criticism of Jesus and Christianity. You can choose to address that or not.
If he knew anything, he wouldn't endlessly confound the worst of and the excesses of State churches especially Roman Catholic (which have litttle to do with what Jesus taught as they are flagrantly disobedient to his commands) and Jesus himself.
You've got to make up your mind whether you're going to attack Jesus, or anyone calling themselves a "Christian." They are not the same.
As for the cursing of the fig tree, that was done with a specific reason, which was to instruct mankind that if they bore no fruit towards God, but merely pretended to, even where it was "not the season," they would be cursed.
Russell arrogantly fails to apply the lesson of the fig tree to his own critiques of "Christians." He should have realized that there are plenty of "Christians" who bear no fruit and so cannot be accounted followers of Christ. To tar such as being "Christian" merely by association or by outward profession is anti-intellectual.