There is plenty of criticism over relying on mathematical models that fail to accurately predict the future (all of the glaciers were predicted to have melted 3 years ago, snow was supposed to have been a thing of the past, etc.), cherry picking data, questionable measurement & sampling, not considering other forcing inputs, etc. It's a complicated claim that has valid criticism on it's foundational pieces If any foundational premise of the claim is invalidated, the entire model is invalidated. The consensus models are complicated so I'm not surprised that it has a difficult time standing up against scrutiny & needs to be adjusted frequently.
There is also dissent among scientists, including from Nobel Laureates (who had opportunities cancelled after dissenting). "The doomsday cult" reference comes from the doom & gloom sensationalism. For example, I a heard chorus of "we are fucked" from coworkers in the office about 15 years ago in response to some news back then. I don't agree that "we are fucked". Humans have been through more environmentally challenging times with less technology & global knowledge.
The climate is changing...always has changed & always will change. What are we going to do about it? Are we going to pretend that we can stave off the inevitable, taxing/restricting the population which weakens their ability to adjust to these inevitable changes...while wealth is concentrated to the elites? There is a widespread perception that is happening. When the issues reach it's crescendo later in this decade & the fallout in the 2030s (winter occurs after the Solar Solstice, solar exposure increases during winter), there will be many who will not buy the APGW narrative as the reason for their problems. The peaceful solution is a decoupling from systems that don't benefit the person/group, which I expect to happen. Others, such as Peter Turchin think there is a high probability of violent uprising & he seems to think addressing APGW is a unifying force...I disagree on both premises but I think his analysis is valid & worth getting into.
I think the animus generated by climate alarmism putting the blame on the population reduces effective cooperation among people & will be exasperated as the climate does change, as the Geomagnetic wander deepens in it's cycle, as magnetic fields fluctuate in our solar system, etc. A spirit of cooperation will unify humanity while the blame game will cause conflict. Doom & gloom is unhelpful. The "doomsday cult" will increase in their doom & gloom as people walk away from their petulance & their social leverage wanes.