The world doesn't seem short of opinions. On most every subject opinions flourish as if the truth depended upon them. Of course, an opinion has little to do with certainty, otherwise it wouldn't be an opinion. When expressed by someone we trust, the opinion takes on meaning. If it is someone inexperienced on the subject, we "consider the source."
When it comes to the gospel, we need not simply express opinions. The Word of God makes it clear that God loves each of us and that He has a plan for us to connect with him into eternity. It's a good plan, and it's not simply an opinion. Hallelujah!
2 Peter 1:20 (MSG)
20 The main thing to keep in mind here is that no prophecy of Scripture is a matter of private opinion.