According to Islam, This is not in connection to the Quran and Sunnah. I have quoted ahadith and Quranic ayaat. This is where I stand
We will be judged in Islam, according to our deeds. But know that in Islam, it isn't our deeds that enter us into Heaven, it is Allah.
You are not an authority on Quran nor am I. I know this in Quran with 100% certainty but who am I to claim to represent Quran or Sunnah?
I know Mohammad (s) and his family (a) intercession is for this world primarily, but their intercession is considered God's intercession just as part of relying on God is to ask the family of the reminder per Quran when we don't know.
They will intercede in next world, but the matter is already decided then, it's only formality then.
Rejecting their help is same as rejecting God's help. There is no way to God without his help. It's like the rope to the ceiling and then cutting it off. It doesn't make sense.
We help one another (humans) with jobs and other things in society, we all help but this role of providing light and connecting to God and guiding is for his chosen. We are to rely on them as to rely on God.
They are the rope of God along with God's book, and holding on to them in all states is necessary, whether one falls or rises, they will intercede by God's permission for souls and connect them if they can.