holding a form of godliness, but having denied the power thereof. Turn away from these, also.  (WEB)

holding a form of godliness, but having denied the power therefore. From these also turn away.  (ASV)

Having a form of religion, but turning their backs on the power of it: go not with these.  (BBE)

having a form of piety but denying the power of it: and from these turn away.  (DBY)

Having a form of godliness, but denying the power thereof: from such turn away.  (KJV)

Having a form of godliness, but denying its power: from such turn away.  (WBS)

and will keep up a make-believe of piety and yet live in defiance of its power. Turn away from people of this sort.  (WEY)

having a form of piety, and its power having denied; and from these be turning away,   (YLT)

How sad for Christians to walk below their inheritance!  God has given so much.  Some do not believe in miracles.  Some believe that there was an apostolic age, though the Bible does not speak of such an age.  Some believe that some gifts will end before the completion of all that God has for us.  They just sit as Christians with no power.  They are naturalistic Christians.  That's too bad. 

Those who do walk forward with God must not judge or condemn those who stay back.  In fact, God has always worked this way, offering His good things to everyone who won't receive it, then to a smaller company who fulfill and who then turn around and bring everyone, even the disobedient, into fulfillment.  First, God offers the completion of salvation to everyone. They won't take it. Then, He selects a smaller company, for example, the Children of Israel.  When they won't walk in it, He selects a smaller company, for example, the Levites.  The Levites had to be the first to step into the waters of the Jordan.  Once the Levites had gone in, then everyone else was allowed to cross.

First, God offered the fullness of salvation to every person.  Then, God selected the universal or general Church, that body of all believers, as a called out company.  When they would not receive the restoration of what was lost during the great falling away in the early Church, God progressively selected a smaller groups of Christians and called them out of the groups that would not walk in the new revelation of Scripture.  Once God's work is completed, God will use those who are faithful, those who take part in the first resurrection, to reach back to those who did not do what was required to enter into the first resurrection.  These called-out Christians are like the Levites, the first who make it possible for everyone else to cross.

As a side note, every revelation of Scripture has been that the Scripture means exactly what it says.