I have been talking to someone lately about the Trinity. Even though I have tried to explain the Trinity to him, he still is not sure if he believes in the Trinity.
I was thinking of a way to help him, but it occurred to me that another angle might be the way to go.
What I am referring to is the importance of believing in the one true God and making sure we are a part of the true Church. (I had trouble with the last sentence)

I believe (and I am probably preaching to the choir, on this forum) that it is essential that you believe that He (God) is a rewarder to those who seek Him (Hebrews 11).
This does not of course mean that we believe in a god and leave it at that, for the first commandment condemns those who have other gods other than the one true God.
Christians believe that the one true God is Trinity (one in essence, three in person). If the one true God is not "Trinity", then it stands to reason that those who believe in the Trinity do not believe in the one true God.
This has far reaching consequences, because even if it was possible to have every other Bible doctrine correct, it wouldn't really matter, since they would not be able to direct what they have learned to the one true God.

Do you believe that this is a good angle to approach this person with?

Also, if you can add something, or even disagree with something I said. By all means do so.

Tom