Spock's sense of hearing was definitely acute, thanks mostly in part to rigorous training of the senses and their peculiar shape. On the inner regions, the Vulcan ear was not much different from their human acquaintances. They had the same tympanic membrane shape. But Vulcans could pick up on higher frequencies than most humans. Spock, however, being only half-Vulcan, could not hear as great a spectrum of sound as his father could. But he could hear well enough to know that someone else had sought refuge in the small church, and that they were sitting not far from him.
Spock didn't respond at first. He didn't even glance in the direction of the unfamiliar woman. He had extensive studies on human cultures whilst training at Starfleet. He understood that religion played an important role in the lives of many homo sapiens. And, being in The City, it was impossible to note whether the humans were of his time or some distant era when religion ruled over societies.
He could also sense her glances. But Spock was accustomed to that sort of behavior. He was the first Vulcan officer ever to enlist in Starfleet. And though there were species far more peculiar than he in physiology, he was always a figure that created a double-take on humans. He was a rarity, both in this world and in his own.
After a few moments of awkward silence between them, Spock turned to look at the woman. She had, what appeared to be, a pleasant disposition about her. At least, he didn't sense that she would pose a threat in anyway.
"If my presence is disrupting to you, I can leave."