Ephesians 2:15

τὸν νόμον τῶν ἐντολῶν ἐν δόγμασιν καταργήσας, ἵνα τοὺς δύο κτίσῃ ἐν αὑτῷ εἰς ἕνα καινὸν ἄνθρωπον ποιῶν εἰρήνην

I invite you to consider plenty of translations if you can’t parse the Greek:
https://www.biblestudytools.com/ephesians/2-15-compare.html

Does Paul or does Paul not here declare that Christ abolished the Law?

The Law, that is, that was supposedly given to Israel by God through the make-believe character of Moses in one day including 613 commandments… that God said was to last forever and Jesus also said was to last forever…

Is this or is this not a fatal contradiction on an important topic in a book that some claim is inerrant?

Whether Paul made it to Heaven or to Hell is of course up for debate, but if he did make it to Heaven won’t he be considered the very lowest of the low according to Jesus?

Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven.

Wouldn’t that also apply to any Christians? That is: if you set aside a rule such as not wearing mixed fabric then you’re guaranteeing that in the circumstance that you do actually make it to heaven you’re going to be the bottom tier inhabitants, aren’t you?