Hm, seems to me conservative Christians encourage created families when they evangelize. When they define their churches as an alternative to the "world," they create something intentionally family-like and exclusive to their "in group" that abides by certain standards of thought and behavior. (Thought and behavior often only tangentially related to genuine religious or theological concerns, such as prohibitions on certain kinds of speech, music, dress, hairstyles, etc.)

Forming (and enforcing) subcultures is fairly normal human behavior, of course, but it's silly to claim that doing so is positive in a conservative Christian context but negative in an LGBTQ context.