There aren't' any
good arguments against NDEs. I've read almost all of the so-called counter-arguments. There are arguments against specific NDEs, because there are people making some of these stories up and cashing in on books. All of the arguments against, involving hallucinations, lack of oxygen to the brain, dreams, the brain shutting down, drugs, etc., don't have much of a leg to stand on, especially if you read the medical data on these specific counter-arguments and compare them with NDEs.
Second, because testimonial evidence is varied, or even contradictory, that's not necessarily a good reason to dismiss the testimonial evidence. For example, if you have 20 people who witness a car accident, and you have, say, 10% of the witnesses contradicting the other 90%, that doesn't mean you can't use the evidence, or that the overall evidence isn't good. This happens all the time with testimonial evidence. I can come to a reasonable conclusion (inductively) based on the 90%. You have to know how to sort through the testimonial evidence and make correct inferences. This is what is done in science, the FBI and in our courts all the time, sometimes we get it wrong, depending on the strength of the testimony or data, but generally we get it right. All inductive conclusions have a probability of being incorrect. However, if the evidence is strong, you can make a claim to knowledge, the inductive conclusion doesn't have to necessarily follow, it just has to be highly probable.
Almost all of our beliefs are arrived at through testimony, viz., books, lectures, videos, etc. You can't doubt most of it without collapsing one of our main sources of knowledge. The point here is that you have to know how to evaluate testimonial evidence. Testimonial evidence is one of the weakest ways to gain knowledge, however, under the right conditions it can be very very strong. This is why I explain in my thread what makes this testimonial evidence so strong. In fact, I would go so far as to say that it's irrational to reject it if you fully understand all the testimonials, the medical data (at least some of it), and much of the research data associated with the experiences. Most people who respond to these arguments (especially in these forums) don't understand the data, and don't know how to evaluate the testimonials.
Much of what we believe is influenced, to a large degree, by culture, family, friends, religion, etc., which is why there are different interpretations of what people see in these NDEs. For example, if you're a Christian, you'll have a tendency to interpret certain beings as Jesus, while in other cultures they may interpret the being as some other religious figure. This is why it's important to look at these testimonials across a wide swath of cultures. That said, there are certain aspects of the NDE that occur in all cultures and in all or almost all accounts of these NDEs. One of the main things that occurs in these NDEs, is the OBE, along with several other experiences that make them very similar. There is statistical data that supports this, so it's not just something pulled out of the air. By the way, this similarity of experience demonstrates why most who study this material don't believe people are having hallucinations, or some other medical problem.
I want to add that I don't think these NDEs support a particular religious view of the afterlife. In fact, if anything, it contradicts many or some of the religious dogma. My own view based on considerable evidence, is that we're having a human experience, but that we're connected to some consciousness source, be it God (but this God, if he/she exists, is probably very different from, for e.g., the Christian God), or some other kind of intellectual power. This isn't a death experience, it's a near-death experience, and these NDEs point to something much more to our lives than we are aware in our very limited understanding.
Finally, there are many unanswered questions, but that should spur us on to pursue the the answers, not to simply throw out the evidence because it doesn't fit a narrative.
There's much more written in my thread -
https://thephilosophyforum.com/discussion/1980/evidence-of-consciousness-surviving-the-body