Well when people say the Bible is tampered with, to a certain extent I agree, but it's mostly things easy to spot if you know how the devil works. I'll give you an example.
I only deal with the King James Version 1611 Bible. It's widely regarded by scholars to be the most accurate to the Hebrew/Greek/Aramaic.
Now, let's take Lamentations 5:10 for our example. This is from the KJV.
10
Our skin was black like an oven because of the terrible famine.
Now, let's look at a view other modern versions of this same verse.
Now, all of the versions beside the KJV essentially state that the people referred to in this verse have a fever due to starvation. The KJV says their skin is black due to the famine in contrast. Knowing that people try to hide things biblically with different translations, what do I need to do to find out what version is most accurate?
I need to find out if famine/starvation even causes a fever. Guess what? It's doesn't.
The body temperature begins to fall in the first day of the period of starvation, and continues falling, so that a loss of ten or more degrees below the normal of 98.60 F. may occur.
http://chestofbooks.com/health/nutrition/Dietetics-4/Starvation-Symptoms.html#.UwKcXc7zYsY
Now, assuming people today react the same way to famine/starvation as ancient times, there's no way the other three versions can be correct unless you're going to say the Bible is wrong which I won't. So, it's obvious what people tried to change, and once you know that, you're able to spot why they changed it. They wanted to take out the word Black so people wouldn't connect the Israelites with the word 'black'. So if the KJV got this translation right, odds are the rest are right also. But again, it's having that discernment and doing research. The Bible is STILL the main source to test what's true and what's not.