That system of points was published as a refutation of the heretical 5 points of Arminian Remonstrance, and are a summation of the judgements rendered at the Synod of Dort in 1619.
It is unfortunate that most folks view Calvinism in context of the 5 points, when in fact Calvinism can be summed up in one. Namely that God completely saves sinners, without any of our help. Some of us just don't realize that we didn't have anything to do with our own salvation. That is solidly Biblical.
how can Arminianism be heretical when that is the belief of Pentecostals, Methodists and many Baptists? Are these Pentecostals, Methodists and many Baptists following heretical beliefs?