Does calvinism limit the gospel? I believe yes. However, we would need to go into this in
more depth to really make a judgement. and yes, you need to understand all doctrines being taught in your church. If not, then are you testing all things? If not, how will you know if a false doctrine comes into the church. Remember, JWs and Catholics don’t join their organisations with the intent to provide a false gospel to the world. They believe what they teach is the true gospel. We are no better than any other person just because you are saved by the true gospel of Christ. You do have a different destination for eternity and you are a true child of God, but in reality, we are all human and make mistakes. So therefore test all things that are spoken by a human in a church. Test these things against the Bible.

Read and study the Bible in context and ensure consistency throughout the Bible with any doctrines or beliefs you have. If the doctrine or belief seems to match a particular verse but
not other verses, or someone has to change the original meaning of a verse to make it fit a
doctrine, then I would say most likely that doctrine is incorrect. The Bible certainly is the
authority. Note that as we mostly use the English translation of the Bible, that you may need to study deeper where you don’t understand a certain word and its origins or meanings. Not everything translates perfectly to English and men did the translations. Yes, versions like the KJV are pretty accurate but they are not perfect. There may still be some bias coming through the translators.

Calvinism I believe, changes the gospel. For a start, they believe in limited atonement and
election without any foreknowledge. Even though foreknowledge is clearly taught in the
Bible. Foreknowledge comes from the word Prognosis. Read more on this here:

http://13.210.35.93/wp-content/uploads/2016/07/The-Foreknowledge-of-Sovereign-God.htm

Basically calvinism teaches that people are elected by God before the foundation of the
world. This is done without man having a say in it through free-will. As calvinist teaching
does not allow for free-will choices by man, who are actually elected through  foreknowledge. Once you read the article in the link provided, you will see how there is certainly an issue with discrediting foreknowledge being used by God. To say there is no foreknowledge of mans choice in response to Gods calling, is basically to make up a belief with no backing whatsoever. They then read the Bible with certain pre-conceived ideas.

If one believes atonement is limited, they will then change the meaning of 1 John 2:2 (And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.) to fit. The whole world then becomes Christians around the world and not all people around the world. More on this in another post.

If one believes that people are chosen by God through election, without any interaction from people themselves (i.e. free-will), then the gospel becomes a waste of time as God has
already chosen everything anyhow. So then we have to explain what Romans 10:11-17 is
talking about:

11 For the scripture saith, Whosoever believeth on him shall not be ashamed.

12 For there is no difference between the Jew and the Greek: for the same Lord over all is
rich unto all that call upon him.

13 For whosoever shall call upon the name of the Lord shall be saved.

14 How then shall they call on him in whom they have not believed? and how shall they
believe in him of whom they have not heard? and how shall they hear without a preacher?

15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!

16 But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our
report?

17 So then faith cometh by hearing, and hearing by the word of God.

The calvinist also says we must be saved first in order to believe. So why do all the
references about being saved that I see in the Bible talk about call upon the name of the Lord, repent, believe on Him, and then be saved? Did all the NT authors get it wrong? The calvinist gospel really doesn’t exist. In fact, look at many reformed churches and many of them are against evangelism, street preaching, distributing tracts, etc. Why? Is it because Satan doesn’t want the gospel preached? You can research and answer that.