“We should also try to be mekarev a Yid who became a Christian.”
Can we answer the question of the OP in the affirmative, based on your own words?
I can shoot the messenger if he distorts the message he is bringing (which nobody asked you to bring, btw). The term Reshaim was applied to those who grew up frum, knew better, and STILL joined those movements. Hardly the same as referring to a 7 year old Conservative boy as a rasha, which you did, whether you meant to or not. When you (not you specifically) use a broad brush and talk in generalizations, you say things that you may not have intended.