As I previously stated, one cannot believe this good news without the belief in the divinity/Trinity of Christ. And the site states that the divinity of Christ and Trinity are non-negotiable(must have) beliefs.
It’s pretty clear:” believing the good news that Christ died for his or her sins ”
If they wish to amend it to “* plus these other items...” they should.
I suspect that it’s more in line with the Easy Believerism of the sinner’s prayer theology.