Yeah it is certainly easier to have fellowship with those who are walking in the Spirit, for sure, and who share similar beliefs. But in my experience I have a much easier time "fellowshipping" with those whom you would consider "not saved" (gentiles, if you will) then most of those in the church whom you would consider "saved". It's awfully hard to fellowship with people who think you're as good as Satan. (For believing God will save all.)
Give me the tax collectors and sinners anyday lol!
For me (and sometimes because of me
) some saved people (including UR) are not the easiest to be around or interact with, depending on personalities and what's being sought as common denominator/point of discussion. Some are great to be around. I have friends/family who are UR, some that are ET, some that do not profess to be spiritually reborn at all. I can have some level of fellowship with all them, but my most intimate would be with those with whom I share the most in common.
That said, isn't Jesus and Him crucified and risen again the critical point of unity all believers (ideally) should have in common, rather than completely dividing over doctrine, "as much as is possible and depends on you" living in peace as Paul said?
Some non-believers are great to be around, some not so much, again, depending on personalities and what's being sought as interaction/point of discussion. Some are outright vicious enemies of Christ. Show love if possible, share Christ if possible? Sure, but IMO, there is likely no basis for intimate
fellowship. Likely living in 2 different worlds ("in, not of").
Observation without digging into it; I could be very wrong, I see through a glass darkly and understand very little of how God actually works all things according to the counsel of His will. But I'm guessing
here, that perhaps Jesus' interactions went something like this? He loved and associated with the harlots and tax collectors, but His relationship with them was not intimate, but was as an Agent of change, as a Helper - not identifying or "joining/yoking together" with their unbelief and as-yet-to-be-reborn sinful nature, i.e., "light with darkness", but rather to bring them to the Light? He chastised and rebuked the Pharisaical religious, those who only pretended to believe and be pious. His deepest (earthly) intimacy was with His disciples, His followers, those He called friends. Even though they were far from perfect or even understanding much at all, there was a spiritual "connection"; this relationship was based on true fellowship of light with light.