If I were to scientifically verify that something is possible once, I have verified that it is possible any number of times. That's why science works.
If stuff happened in only ones, science won't work. That's the world operated by the whims of a god. There is no evidence for any god.
Consciousness is a natural process. It's not knowable how a brain can make consciousness, but all evidence is that it is created by brain processes.
When we die we are in exactly the same state we were in before we were born. In an infinite universe or multiverse in time or size, anything that is possible will happen an infinite number of times. Since there is no evidence for any dying soul, we are likely to return with the same consciousness in a different body.