Thanks everyone, for your responses.
I think i'm probably oversensitive to this issue because of my circumstances. No one in my family is Buddhist, in the United States. Not one of my closest friends is Buddhist. Most are Jewish. My wife's family is Buddhist, but its not something that we talk about, the dharma.
My parents are Unitarian Universalists, and that's how I was raised. Tolerance is probably one of the most important things for UUs. I teach at a Baptist Christian University in Japan. About half the faculty is Christian, half Buddhist. Most of our students are Buddhists, but don't practice or study the dharma that deeply. The atmosphere at our University is very tolerant, the Christians are respectful of the Buddhists, and visa versa. Religion isn't really a topic of discussion, actually. I guess that's a form of tolerance, in some ways. We just treat one another as people, fellow human beings. Religion doesn't come up as something to discuss.
While I've been drawn strongly to the dharma since the early 1980s I've also gone to Hindu and Taoist texts/writing at times, for inspiration and guidance. Native American Indian wisdom, as well. I'm not attracted to Christianity, Judaism or Islam, but I have close friends who practice, who seem to benefit in their lives from their faith. I find it all fascinating, the spiritual quest of humanity. The various paths are not all the same, but when people meet the world with an open heart and open mind, I don't really notice any differences. Like a guy who loves classical music hugging his friend who's into punk rock, the music is not primary, its simply part of the background. It's their connecting as two friends, as humans, that matters.
For me, a person's spiritual beliefs are something personal, that I respect, without judgment. And when others say critical things I tend to defend other faiths. I've noticed that this gets me into debates at times, and makes me feel a bit uncomfortable, sometimes, in discussions with fellow Buddhists, where other faiths are mentioned and criticized.
Maybe I need to simply steer clear of the conversations that deal critically with other religions?