What doctrines are surely required to be believed to be within the one Christian faith? Considering there are degrees in error and heresies, at what point does error or heresy put one out of possibility of eternal life?
ANY deviation in the biblical Gospel is damnable heresy which would include classic Arminianism (cf. Synod of Dordt
, semi-Pelagianism, sects and cults. That covers most of what is currently being taught and embraced by the majority of 'evanjellicalism'. A false gospel embraced cannot save!
What would be your answer to your own question?