Q: If I feel oneness, will I still feel that sense of oneness after my death? Do Buddha, Ramana, or Jesus still feel the oneness as they would have felt it when they were alive?
A: This is a good question, although no one can really answer it until they die. There are some mysteries that are meant to be mysteries. When it comes to something like death, what we don’t know will always be more than what we do know. Not knowing something can actually be very rich and exciting.
So far, based on my experience with living, my guess is that there is no formula for what happens when we die. Just as everyone’s experience of life is unique, it seems likely that everyone’s experience of death would also be unique. Some people might dissolve back into the oneness without any trace of individuality remaining. Others might have an expanded sense of their true nature but with a sense of identity as someone who is experiencing the vastness of Being. And others might retain a strong sense of individual existence, which might suggest that they would reincarnate again to satisfy their remaining karma or individual desires.
We all eventually get to find out what happens when we die. In the meantime, we have the mystery of what is going to happen before we die! Will I fall in love today? Will I be happy or sad today? Will I realize my true nature today? There are endless small mysteries to be discovered every day and even some big mysteries. Your question is a good one because it shows curiosity. Since life and death are so unpredictable and unknowable, your curiosity can serve you much better than any answer to your questions. It can be very surprising to discover that questions are almost always more satisfying than answers.