Some members (at least the vocalist) went to non-vk band BLASPHEMY TO GOD.

Do you know if this band released stuff ?

I have no information on any releases from that band. There was a short live video from them performing one song live at 東京 福島 HEAVY METAL SUMMIT 2 in 2012.
I have to correct that at least the Drummer is the same as in GREGORY, but at the time it was speculated that all members are ex-GREGORY.

Seems legit could potentially be added as a new session of sorts but its not known if its non-vkei or vkei related info. I managed to only pull the profiles with some magic but seems like sou is the only one who changed his profile to that bands name no one else. Everyone else's ameba got removed/deleted. Based on the information i got from MH it was most likely a session band and All other members were not confirmed to be related to GREGORY besides the drummer who is on this profile ameba. The vocalist of that band was named 誠也 (seiya) who left the band. Based on that information alone so far its assumed only the drummer is related to BLASPHEMY TO GOD.

We could also note that GREGORY planned a revival but it was canceled or no mention of the revival happened but due to the lack of information its hard to say. Based on what the band wrote on their official website its highly unlikely the band will continue activities and even if they were to have revived, it would have probably been for that one day revival to disband which no proper information has surfaced if it ever happened. I hope this information is helpful to you:
https://profile.ameba.jp/ameba/iorigregory
https://profile.ameba.jp/ameba/sougregory
https://profile.ameba.jp/ameba/gregory-yuki

I would say BLASPHEMY TO GOD was non-vkei based on the video mentioned above (as far as I can see they do not wear make-up and all wear blue business-like shirts). However, in the one song of the video they sound exactly like GREGORY instrument-wise (similar to DISGUISE ON TEAR but with a melodic chorus (?)). I would say the bassist and guitarist could have been both from GREGORY judging by their hair/face and instrument sound but that is just speculation. No idea of the vocalist. It could be Iori if he sounds live a little different (similar style but voice a little different) and completely dropped all his vk look since he looks like a rather normal short haired office worker (to me).

Interesting note. Thank you for the information I didn't know if they were non-vkei or not. If we are able to get more concrete data on that band then we can add them otherwise will prob leave it as is for now.