I would like to wait more for more information. This speculation seems incomplete and premature, and in the end, likely, inaccurate.
Political assassinations rarely stem from one particular situation or event, but accumulation of beliefs and world view over a long period of time. He may stated his disdain for Abe to be his connection with the religious organization, but that can easily be just one of many reasons that he believes have re-enforced him to commit assassination.
The assassin went through a lot of trouble and difficulty building his own gun and ammos. I think it's probably more likely that there's more political and ideological motivation behind his action than just Abe's roundabout connection to the church that ruined his mother. It's just too speculative and unlikely for now until there's more evidence.
The assassin stated that he killed Abe due to his association with a "certain group", so this theory lines up nicely. Of course it's all speculation until we hear from the suspect themselves.
Political assassinations rarely stem from one particular situation or event, but accumulation of beliefs and world view over a long period of time. He may stated his disdain for Abe to be his connection with the religious organization, but that can easily be just one of many reasons that he believes have re-enforced him to commit assassination.
The assassin went through a lot of trouble and difficulty building his own gun and ammos. I think it's probably more likely that there's more political and ideological motivation behind his action than just Abe's roundabout connection to the church that ruined his mother. It's just too speculative and unlikely for now until there's more evidence.