There is an argument that you never really accepted Jesus if that was your next action, but Biblically speaking, there are no other wickets to pass other than accepting Christ as Lord and Savior. It is what differentiates Christianity from all other religions. No further means tests. Now if you then reject Christ later, then you can be lost. But we dont have to atone for each and every sin (we seem to want to do so anyway out of guilt). And sin is sin, to God it doesnt matter the severity. But Jesus washed all this from us on The Cross.
How we live our life after accepting Christ and how we try to get closer to Him by following His example, does, by some interpretations, effect our ‘status’ in Heaven. Of course we dont really know what that might mean as we cant begin to imagine what Heaven really will be like.
“And sin is sin, to God it doesnt matter the severity”
False. Protestant heresy.
And the “never really accepted Jesus” is tautological: a circular argument.