Athiest Penn Jillette (of Penn and Teller) states that he doesn’t respect Christians who don’t share their faith. This is sound and convicting:

“I’ve always said, you know, that I don’t respect people who don’t proselytize. I don’t respect that at all. If you believe that there’s a heaven and hell, and people could be going to hell, or not getting eternal life or whatever, and you think that, well it’s not really worth telling them this because it would make it socially awkward…How much do you have to hate somebody to not proselytize? How much do you have to hate somebody to believe that everlasting life is possible and not tell them that? If I believed beyond a shadow of a doubt that a truck was coming at you and you didn’t believe it, and that truck was bearing down on you, there’s a certain point where I tackle you. And this is more important than that.”

HT. Baptist Press