I don't know if we have a Buddhist expert here. Nor do I consider it necessary to convert you. I have limited knowledge of Buddhism. I primarily suggest that you have limited knowledge. You don't feel like someone to me whose much looked into Buddhism. You don't feel like someone whose much looked into the occult either. You have some bad experience with your heritage, and ask if your vague limited background in Buddhism is interfering with your vague limited practice in the occult.
I dunno. Whatever.
As for Pure Land - while they would generally advise it's practice, based on having read some Honen or certainly Shinran, I don't get the impression that continual practice is necessary to be "saved", so much as that one might benefit. I can comment from my own minor experience with it that unending chanting is not necessary to get results from it. I don't think chanting is a necessary component at all.
" by the efficacy of the ancient prayer of that Tathagata, those who think of and remember him shall certainly be able to accomplish their aim."
"the beings who will be born in the middle form of the highest grade are those who do not necessarily learn, remember, study, or recite those Vaipulya Sutras, but fully understand the meaning of the truth contained in them, and having a firm grasp of the highest truth do not speak evil of the Mahayana doctrine, but deeply believe in (the principle of) cause and effect"
Simplification into chanting is, if I recall, Honen. I would have to read Honen again, but I do not think this is the point. The chanting is a simplification so that more people can do it. If you cannot remember the Buddha Amitabha, then just chant him, you can improve your station that way. The doctrine that you will go to hell if your practice fails - this is contrary to what I understand of it. Whores go to the Pure Land. Maybe someone with some extreme variety of sin does not go there.
Five Grave Offenses (killing one's father, killing one's mother, killing an arhat, shedding the blood of a Buddha, and creating a schism in the Sangha) might find it challenging to be reborn in the Pure Land without sincere repentance.