If true, that points out a similarity. What Steve says there happens to be what I believe, as does almost everyone on this site. The fact that it might also be a Mormon belief is a completely separate issue. But it might also be useful. I could possibly be an undercover Mormon. Now in the case of Socinianism, it is well known and documented over the years, whether it's fair or not, that teaching a universal atonement, teaching that belief is itself part of the requirement for salvation, or teaching that good works after initial justification are required for final justification, are things that do often lead to Socinianism is valid when discussing any of those items. The fact that full blown Socinians believe other things directly contradictory to orthodox Christianity is true, just like it is true that Mormons believe other things completely contradictory to orthodoxy Christianity. But pointing out a similarity as a point of argument or as a warning to a soul should be encouraged in fact. It's not a slander at all.
When the Puritans pointed out that allowing one sin to reign unchecked in your life was possibly the beginning of future apostacy, they were not calling those they were speaking to apostates. They were calling the folks to examine what they were doing.
If that were the case then your belief, being a Mormon belief, could lead you to Mormonism.
There are many positiins within orthodox Christianity, to include my position, and to include your position.
Yes, heresies are often 90% truth. It is that 10% that makes them unchristian.
Take Socinianism. What is the core idea? The core idea is that Jesus was a human prophet, no more. Therefore He is not God. The "atonement" is Christ showing us by example how to live our lives to meet divine approval.
Socinianism is a complete rejection of my view. It is a complete rejection of your view.
Are there things in their faith that were true? Yes, obviously, as Socinianism is a "Christian" hesesy. Are there things the Mormons believe that are actually true? Yes, as their doctrine includes a lot of Christian belief.
Should we ignore truth because cults also acknowledge then in fear that acknowledging truth could lead one to a cult? No.
We cannot reject the 90% of what is true simply because we fear that truth will lead to accepting the 10% that is false.