Terry Mattingly has a set of three questions which he thinks will nail someone as a modernist, which apparently must be a bad term.
Are the biblical accounts of the resurrection of Jesus accurate? Was this a real, even if mysterious event, in real time?
Given the diversity of the texts that's a hard claim but since there is a hedge in this question, terms like real and mysterious, this capture a range of options, including Paul's confused description at the end of 1 Corinthians, a description and a confusion that I'm likely to go with.
Is salvation found through Jesus Christ, alone? Is Jesus the Way or a way? I'm sure I'll get nailed, since I don't see Jesus as the sole means of salvation. I don't see how one can get a monotheistic account that limits God's saving work to a single time period, a single religion, etc.
Ultimately I question whether the NT seeks to do such a thing either. "Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all dominion, authority and power. For he must reign until he has put all his enemies under his feet."
"When he has done this, then the Son himself will be made subject to him who put everything under him, so that God may be all in all." 1 Cor 15:24,25,28 Monotheism is never compromised. Even the instruments of God's saving work are subordinated to God's purposes.
This is why I get baffeled when folks speak of a Christian God or a Muslim God. There is no such thing, only Christian descriptions of God and Muslim descriptions of God. They may or may not provide resources for life, but God ends up being larger than this.
Is sex outside of the sacrament of marriage a sin? Until marriage is seen as an act of God, not of the church, which is marked by love, committment, mutuality, etc then marriage is no indicator of the morality of sexual relations. I'm a modernist afterall.