Single - a Challenge to Family?

For my member care class I had to read a book called Single Women: Challenge to the church? by Kristin Aune. While I found most of the book so-so, there were a few points that really stuck out to me. One of which was Aune's comment that "singleness challenges the Christian definition of 'family.'" She went on to quote Ben Witherington as saying "What is desperately needed and seldom found in the church is an adequate theology of the family and faith... blood should not be thicker than the baptismal waters in the church. His [Paul's] idea of family 'church' is actualized where God's people treat each other as their primary family, not just as some secondary social gathering that happens once a week and that promotes the agenda of the nuclear family."
I often find myself forgetting that the church is to be my primary family. I am easily swept up in the notion that being married and having a family would somehow be better for the church or society - not that these things are bad, but they are not the most important. Jesus, when called by his nuclear, biological family to come be with them as opposed to staying with his followers declared that whoever does God's will is his family (Matthew 12:48-50).
It is sometimes amazing to believe that total "strangers" could stick with you through thick and thin, but that is the call of the church. As single people we have the opportunity to make clear that family is not of the first importance (not to dismiss the importance of honoring one's parenting and loving them well), but the church is to be primary. That is our call to be the church, to be family to those within it (and love on those outside it).