Definitely true. While we seem to disagree on alot of the mechanics on how things come about, we do seem to all agree that sin does result in bad consequences in ones life, regardless of whether we agree on who is the one behind it. While the believer may not face an eternal consequence, (other than lack of reward), he/she may well face a natural one, as sin in the flesh reaps a reward in the flesh. Makes me think of 1 Corinthians 5 where a christian brother was sleeping with his stepmother:
3 For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed,
4 In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,
5 To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
-1 Corinthians 5:3-5
Seems to me that he was likely to face a physical consequence in his fleshly body, administered by satan, yet his spirit would still be saved. Not a good place to find oneself, to be sure.
In such a case, this brother could try to believe God all he wants for deliverance from the physical consequence of his sin, but until he repents, he wont get nothing.
Peace...