Is this the one? "I come to the garden alone, while the dew is still on the roses, and the voice I hear calling on my ear, the Son of God discloses. And He walks with me, and He talks with me, and He tells me I am his own, and the joy we share was we tarry there, non other, has ever, known."
I remember Blessed Assurance as well. I was raised Christian too, and I no longer am either. But the hymns come back to me and comfort me sometimes, not because of Jesus, but because it was part of a childhood I shared with loving parents. It's too bad your mom left you so early. I'm sure she loves you as much as she ever did, and her spirit is in your heart and all around you. "Peace, be still."
That's it exactly, I understand her more now than I ever did in her life unfortunately. But it's like you're getting a hug from wherever, yes I'm still here for you. If there is a hereafter I want to see her again to apologize. Then again if there is a hereafter maybe you don't have to, they know. After all your critters trample you at the Rainbow Bridge.
"The Old Rugged Cross", "Amazing Grace"...so very many. My grandfather used to have a Kate Smith record he played all the time...like you say it doesn't have to be about Jesus...rather memories that the old hymns bring are so comforting.