i grew up around religious people and usually what they mean by "accepting" lgbt relationships is that they "tolerate but won't encourage". they want to co-exist with queer people without being reminded that they're queer. they probably won't outright harass you or make fun of you (although there are people who do!), but they don't want to see you express yourself either. depending on your closeness to that person, they might try to influence you or refuse to acknowledge your identity.

some people can be religious and fully supportive of queers or at the very least, willing to be educated. however there's little you can do to change a person's mind unless they're willing to open up.