it's about having something in common
and
being able to communicate
How about witnessing the gospel of Jesus Christ being our Lord and Savior? Would that suffice as something you'd consider common enough between believers? Because I refuse to subscribe to any denominational doctrine that teaches otherwise and most of them do.
Like I said...I fly by the spiritual seat of my pants being led by the Holy Spirit...that's the only pastor, teacher, evangelist I trust these days.
I did my time in the church of four walls as God led me to back in the day when I was bottle feeding. The Lord has never led me to another since then. I attend some still when I'm invited, but only then and usually...I never return to them. I see God using me in other areas of my life with regard to witnessing to those He places in my path. It is sufficient for me as I wait upon God to instruct me in all things...at least I try with each new day.