If no one knows what we will be judged on, then everyone is free to do what he/she wants to do. This, however, is in total contradiction to the teaching Scripture.
We know what we will be judged on, we just don't know how He will judge. I don't see a contradiction, unless you think man is capable of understanding God completely.
Everyone is free to do what he or she wants to do, with the understanding that our Creator wills us to do certain things and that there will be consequences for rebellion.
Now, the topic we are discussing is Baptism (Immersion) essential to salvation.
I don't want it thought that baptism shouldn't be done (it should) or that baptism by immersion is bad (it's not) but is it proper for members of a denomination that insists on immersion, to tell members of a denomination that does not, that they are not Christians?
If baptism by immersion is essential to salvation, then absolutely.
I, however, think such effort is worse than foolish in that it demeans Christ and will dissaude people from following Him in the spirit of truth that He wishes.
This means baptism by immersion is not essential to salvation.