Do you have to believe in the Trinity to be saved? I have a friend who is a Oneness Pentecostal who does believe Jesus is God who died for sins and rose from the grave. However, he does not believe in a Triune God. They believe God showed Himself as the Father, then the Son, and now the Holy Spirit.
You ask a very good question. Although the doctrine of the Trinity is a fundamental doctrine of the Christian faith, I do not personally think that a person needs to have an orthodox understanding of this doctrine in order to be saved. Indeed, when you think about it, many of the people in Christian churches today have an inadequate and unorthodox understanding of this doctrine (but this doesn’t necessarily mean that they aren’t saved).
The Bible is very clear that we are saved by the grace of God through faith in the person and work of our Lord Jesus Christ. Certainly, in order to trust Jesus properly, one must have some genuine knowledge of who He is and why He is capable of saving those who trust Him. But the Bible never teaches that it is necessary to have a correct understanding of the doctrine of the Trinity in order to be saved. All that is required is trusting in Jesus, the One who is truly God and truly man, and who died for our sins and rose from the dead in order to reconcile us to God.
So the bottom line is this: although your friend has an unorthodox view of the Trinity, I personally believe that he or she can still be saved through genuine faith in Christ. Of course, if one were to deny the deity of Christ, that would be another issue! But in the case of your friend, what he or she essentially holds is a modalistic doctrine of the Trinity. And this doctrine, while unorthodox, does not deny the deity of the Father, Son, and Holy Spirit; it rather denies that there are three coequal and coeternal persons who are God. This is significant, to be sure. But I don’t think it’s the kind of false belief that will prevent someone who genuinely trusts in Jesus from being saved.
Shalom in Christ,
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