[Trying to be gentle here. You either had a relationship with Christ or you didn't. If you did, you can't just make that going away by deciding you don't believe in Christ any more than you can make me go away by deciding you don't believe I exist in any form or you can make whatever relationship you have had with a spouse or children or friends or relatives or coworkers or even a casual acquaintance go away just because you decide they don't exist any more.
You can see how illogical it is to say you had a relationship with Christ but that he doesn't exist? Obviously, if you believe he doesn't exist, you never had a relationship at all. You were simply going through the motions and 'doing Church' and stuff.
I know that this is your belief, but you're incorrect. I understand that your paradigm is predicated on these views, but you're positing a false dichotomy. The OP is about the fact that many people have ecstatic religious experiences, in a variety of settings, with a variety of deities, and that this is a reflection of a condition within our brain, and not an external entity. You are willing to recognize only those ecstatic experiences which occur within your own paradigms. I would say that they are all the same.
In my experience, I realized that the religion (Christianity) was illogical, that there was zero evidence for it, and that it wasn't morally or intellectually coherent. I lost faith in the religion, and I lost faith in the existence of a savior.
However, since losing faith in the architecture of the religion itself, I've subsequently and often repeated the feelings of connection to a "higher power." I had those feelings at a rock concert, I've had them in my backyard, and I often have them on my drive to work. In short, the emotional connection that you routinely experience with "christ" is something I experience all the time, in spite of my loss of belief in the existence of Christ. I still feel connected to a higher power, I still have those feelings all the time, but I have zero confidence in the doctrines of the Christian religion.
That "relationship" is not predicated on believing in Christ, the Christian religion, or the Christian dogmas and doctrines, in spite of your views.
I'm not an atheist, though. I'm simply non-religious. I exercise that personal connection to the divine all the time, but I have zero interest in church or imaginary religious figures like Jesus Christ.
p.s. There's a huge, obvious difference between real living people and invisible deities. I'm going to hope that you're able to see it.