Pamela, I don't know if this is helpful, but:
I've seen people apply the label "Sadducees" to various "leanings" in theological circles, from "Modernists" who allegedly deny the scripture (as opposed to fundamentalists who allegedly don't) to both "Social Gospel" adherents and "Prosperity Gospel" adherents who seem to concentrate solely on the material well-being of their followers and/or the world as the measure of God's favor.
If we look at it from just the "doctrines" the Sadducees "denied", there is such a twisted mish-mash of belief in the various sects it makes the the Judaic versions in Acts impossible to pin 1:1 on any single sect of Christianity. For instance, most Christians do not "theologically/doctrinally" (in their creeds) deny the resurrection of Christ (though some do). But among those that don't, few believe He actually died--they will say they do, but they don't, because they don't believe when He died He was dead--so, in that way deny the Resurrection of Christ. Likewise, they deny any resurrection because they don't believe the soul is mortal. Indeed, they don't even know what a soul is.
So in that way, at least, pretty much the Entire Church is infested with the Leaven of the Sadducees, which is what Jesus warned against. Years ago, I read an obituary that made no mention of the loved-one going to heaven or such, but was pretty accurate in attesting to the awaiting for Resurrection, but it was written sometime in the 1800's. Maybe there is a little church or denomination somewhere that teaches the mortal soul and our only hope, but I don't know where or what it is.
Mat_16:6 Then Jesus said unto them, Take heed and beware of the leaven of the Pharisees and of the Sadducees.
Mat_16:11 How is it that ye do not understand that I spake it not to you concerning bread, that ye should beware of the leaven of the Pharisees and of the Sadducees?
Mat_16:12 Then understood they how that he bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees.
There's probably more to it in correlation--there usually is--but it's not so important to pin the entire label onto any particular group in Christendom as it is to beware of the Leaven/Doctrine.
There certainly are modern day spiritual Sadducees just as there are modern day spiritual Pharisees. The one thing they have in common is false doctrine, though the "falseness" is not identical, still clashes, and is more convoluted now than anything that existed in the old days.