Calvinism vs. Armenianism: Part 2

When it comes to an individual who comes to church and then leaves the church even if at some point the individual professed Christ as Lord,  everyone has differing opinions on it.  The Calvinist would suggest that Joe is like Judas and he claimed to be one of God's people but never really was one of them and then left. 
The Armenian would suggest that Joe did accept Christ and was saved but has now rejected God's free gift. 
The problem with both those views is they both come from different passages of the bible.  In a nut she'll,  you can't escape either one,  thus there is a never ending argument in theological circles,  as I stated in part one. 
So here's the thing with the die hards in either category.  They get all hung up on why that guy left but not the fact that they need to get Joe back in the church. 
So here's my plea.  Don't neglect those who don't know Jesus by arguing about them.  Create a safe place for them to come to know Jesus in a very real way.
God warns us a few times about quarreling about things that don't ultimately matter but rather commands to make disciples and teach them all he has commanded us.