You are asking for speculation; I am sure the God of Israel had no part in the removal of circumcision; circumcision is still practised by some, and the reason some do not get circumcised is that many doctors do not approve of it.
I believe Paul did not work alone but was an errant boy for the Pharisees. There was contention between Paul and the real apostles from Jerusalem; Paul would have led the apostles had they allowed it.
I reject Paul for infinite reasons, essentially, Paul is a distraction from Christ and His teaching,; if we consider Isaiah's prophesy, “they will use Christ's name only and wear their own apparel.” Paul becomes the apparel many Christians wear; many wear other apparel, but few wear the apparel provided by the Bridegroom; the many should expect to be cast out.
There is the covenant of the great living God of Israel; then there is: the covenant according to Moses, (Moses failed and was not allowed to enter the promised land); the covenant according to the Prophets; the covenant according to Jesus; the covenant according to Matthew, the covenant according to Mark; the covenant according to Luke; and the covenant according to John. There is a different covenant according to Paul, and if anyone preaches a different covenant to that of Paul, let them be cursed. The gaul of that bloke; he encountered an angel of light on the road to Damascus; he claims Satan can change into an angel of light; he claims to be the greatest sinner; he claimed the end cannot come until the man of sin is revealed; and all of this with a straight face.
There is more to circumcision than most realise. Circumcision begins the sanctification process; while Jesus's blood is God's blood of the covenant, in a blood covenant, blood is required in four ways, to establish the blood covenant Blood from each party to the covenant is required, when the covenant is broken the blood of the guilty party is required (could be each party). Circumcision is or was Israels blood of the covenant, a prerequisite for entering into the covenant; what do Christians use as their blood of the covenant; a glass of wine and a sun biscuit or a splashing of water.
I don't see Paul preparing anyone for the second coming of Christ. On the other hand the Prophets of old could have prepared Israel for the first coming of Christ, so can these same prophets prepare the world today for the second coming; Isaiah through to Malachi.