And many of these various splinters of "Christianity"teach different ways within the splinter groups of their own titles. For example, Reformed Baptist teach differently on salvation than other Baptist churches.
Well, rather than listening to what the churches, pastors, priests, and authors who hold to man-made theologies say, why not go to the Word of God itself? What does it say?
Acts 16:30-31 is one of, it not the most, straightforward verses on this matter. In the passage a jailor asks Paul and Silas, "Sirs, what must I do to be saved?" Paul and Silas promptly reply: "BELIEVE in the Lord Jesus Christ and you will be saved!". Seems pretty simple, doesn't it?
Sadly, verses like these are either ignored or twisted to fit a certain brand of theology.
Most of these types of Christianity are based on man-made theologies and philosophies that they interpret scripture though the lens of. Most have a preconceived idea or philosophy going into reading there Bible. They approach it with certain teachings or doctrines that they believe as truths. As they read scripture they understand certain verses to mean certain things in regards to their theology. That is how they explain the verses.
Heres an illustration to help you understand that:
Lets say that you have green tinted glasses, everything that you see through them will be various shades of green because you are looking through green lenses. But in reality, most things aren't really green. Sure, there are some things that really are green and those match up with the lenses, but not everything is green.
Its the same with theological lenses. Sure, some things seen through theological lenses match up with scripture and are true, but in reality, a lot of things don't match up with them, therefore they only see them in light of that theology's teachings. People are so accustomed to wearing these theological lenses that they refuse to take them off and see what is actually there. They are so used to a world of green that they are convinced that everything is green and everyone who sees differently must be wrong.