That is certainly the belief that many have expressed. Yours is just a different wording for "it doesn't matter what you believe, as long as you are sincere". That is contrary to Christian Cannon. It makes a mockery of "one God, one rout to salvation. "
Consider.
Catholic doctrine is the bread and wine at communion becomes the substance of the body and blood of Jesus the Christ, i.e. transubstantiation.
Episcopal doctrine is that Jesus the Christ is present alongside the substance of the bread and wine, i.e. consubstantiation.
Most Protestants look at the bread and wine as symbolic of the body and blood of Jesus the Christ and when they are partaken, it is a memorial service, i.e. in memory of the sacrifice of the body and blood shed for the remission of our sins.
Jesus is quoted as saying at the last supper: Luke 22:
19 And he took bread, gave thanks and broke it, and gave it to them, saying, “This is my body given for you; do this in remembrance of me.”
20 In the same way, after the supper he took the cup, saying, “This cup is the new covenant in my blood, which is poured out for you.
Do you think God condemns the sincerity of one of those beliefs over the others? That it is really important to our salvation?
In the original King James translation of Isaiah 45:ll ". . .Thus sayeth the Lord. . .concerning the works of my hand command ye me. . . ."
In the Revised Standard Version translation: ". . .Thus says the Lord. . .Will you question me about my children, or command me concerning the work of my hands? . . ."
In some modern paraphrased translations: ". . .How dare you command me concerning the work of my hands?. . .
Which is to be taught? The original translation? Or what theologians believe to the a more accurate translation? Does it really matter all that much to our salvation?
Many Christians take the 6 day Creation of the Earth story literally and believe it. Many Christians believe the Bible teaches a flat Earth concept.
Many other Christians take the 6 day Creation of the Earth story as symbolic--no less a miracle of God but a very long miracle and they accept that the ancient ones had no way to know of a round Earth or other heavenly bodies because what they saw/experienced was flat.
Now I ask you. Who on Earth has the authority to dictate to another person what they are required to think or believe? We can share what we think and believe and some of it will likely be right and some of it likely be wrong. Jesus did not command us to be correct in our theology but we are commanded to love God with our whole heart, soul and mind and to love others as we wish to be loved. His harshest criticism was of the Pharisees who religiously obeyed all the rules, dogma, and doctrines of their religion but neglected what God really wants from us.
And I'm pretty sure that God is big enough that nobody is qualified to know exactly how He is going to accomplish anything including how people are drawn to Him and to Heaven.