You need more than the truth, to be saved. You need more than belief, because even the demons believe.
What you need is obedience.
Unfortunately, very few seem interested in obedience anymore. Righteousness is far too rigid. In our enlightened times, our pastors seem unwilling to say that the unrighteous will not enter the Kingdom of Heaven.
We have a Just and Righteous God who demands that we submit to Him. It is all-or-nothing, and too many have tried something in between.
We even have a recent example in Josh Harris.