I assume you mean the dictionary definition of "adulation", viz., extreme or excessive admiration or flattery.
Taken all by itself, it is hard to see how this could ever be gravely (mortally) sinful, people often go overboard in praising others, and it is unlikely that grave harm could result from it. (Personal note, many members of my non-Catholic extended family would praise one another to high heaven for their outward goodness and virtue, it got pretty nauseating to listen to, cloyingly sentimental, but I wouldn't go so far as to call it mortal sin, possibly no sin at all, just mawkishness.) Now, if you are praising people for sin, yes, that is sinful --- I'm not going to get into mortal/venial distinctions here, I suppose it would depend upon whether the sins you are praising are mortal or venial --- and praising them for schism, well, that's pretty bad.
Why in the world would you praise someone for sin? That sounds kind of twisted. Bottom line, just don't do it. And if you are commanding people to sin, cut it out. That has no place in the life of a Christian.
Beyond that, I have to recommend that you ask a priest how these sins are to be confessed, but again, just don't commit them in the first place, and you will have nothing to confess. And if you think you might incline to scrupulosity, tell him that too. Priests deal with that all the time.