Matthew 9:12-13: "It is not the healthy who need a doctor, but the sick. But go and learn what this means: 'I desire mercy, not sacrifice.' For I have not come to call the righteous, but sinners."
Religion is fundamentally about teaching man how to love unconditionally, yet the very act of trying to convert condemns him, you call them sick by the mere suggestion.
All are already acting in love, some misguided but love is all that ever moves. You can call them to a more full love if you even know it yourself, but you cannot create love in them. The very fact God is in them shows they already have love, it is only whether they let love act or ego act.
Acting in any way contrary to love IS sin.
The only law Jesus gives is "Love the Lord your God with all your heart, and love your neighor as yourself". The prior is for building love in your own heart, the latter is saying to share it rather than keeping it for yourself.
1 Corinthians 12:12-27 is also something beautiful to understand, for it shows the correct meaning of "as yourself":
Unity and Diversity in the Body
12 Just as a body, though one, has many parts, but all its many parts form one body, so it is with Christ. 13 For we were all baptized by[
a] one Spirit so as to form one body—whether Jews or Gentiles, slave or free—and we were all given the one Spirit to drink. 14 Even so the body is not made up of one part but of many.
15 Now if the foot should say, “Because I am not a hand, I do not belong to the body,” it would not for that reason stop being part of the body. 16 And if the ear should say, “Because I am not an eye, I do not belong to the body,” it would not for that reason stop being part of the body. 17 If the whole body were an eye, where would the sense of hearing be? If the whole body were an ear, where would the sense of smell be? 18 But in fact God has placed the parts in the body, every one of them, just as he wanted them to be. 19 If they were all one part, where would the body be? 20 As it is, there are many parts, but one body.
21 The eye cannot say to the hand, “I don’t need you!” And the head cannot say to the feet, “I don’t need you!” 22 On the contrary, those parts of the body that seem to be weaker are indispensable, 23 and the parts that we think are less honorable we treat with special honor. And the parts that are unpresentable are treated with special modesty, 24 while our presentable parts need no special treatment. But God has put the body together, giving greater honor to the parts that lacked it, 25 so that there should be no division in the body, but that its parts should have equal concern for each other. 26 If one part suffers, every part suffers with it; if one part is honored, every part rejoices with it.
27 Now you are the body of Christ, and each one of you is a part of it.
As you do not call your hand something other than your body, so each man should be taken as part of one body.
It is not possible to be other than part of this body in this universe - first chapter of John tells us this.
All have their part.