What's a person to believe?

With so many denominations (and 'non-denominations') in Christendom, it can be confusing to the thinking Christian as to what to believe. 

For myself, I have come up with a simple Litmus test to determine what if any stock to put in what is said:

First, does the speaker use the KJB as their Final Authority and, just as important, how to rightly divide it?

Second, does the speaker know/recognize the unique and distinct apostleship of Paul to the Gentiles in this present day of the grace of God.

If they pass that test, then and only then will I ‘consider’ and ‘search out’ what they say; because, otherwise, they only gender questions and confusion.

Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned [of Paul]; and avoid them. FOR THEY THAT ARE SUCH SERVE NOT(!!) our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple. [Romans 16:17-18 KJB] ...emphasis mine.

It is as simple and clear as that...to me. But don't take my words--or any man's words--for it, alone. Study it for yourself and let the Holy Ghost confirm it for you!

Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth. [2 Tim 2:15 KJB]

Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual. [ 1 Cor 2:14 KJB]