Thou hypocrite...

It's not a sin to be yourself. How else can you be true to others? As the Bard said, "To thine own self be true, and it must follow, as the night the day, thou cannot be false to any man." Does it not follow that, if you are not true to yourself, you are being false to others?

It is a sin to keep your children in ignorance of me, because I am who I am. First, you are bearing false witness - you are lying to your children. Second, you are preventing them from getting to know a truly beautiful and loving person. Third, you are judging unfairly. As Jesus put it:
"Judge not, that ye be not judged. For with what judgment ye judge, ye shall be judged ... and why beholdest thou the mote that is in thy brother's eye, but considerest not the beam that is in thine own eye? ... Thou hypocrite, first cast out the beam out of thine own eye: and then shalt thou see clearly to cast out the mote out of thy brother's eye."

Worst of all, when you intentionally keep children ignorant of any particular group of people, whether they be blacks, or Jews, or gays, or trans, you perpetrate a culture of violence against those people. You may have no ill intentions, and may even believe that you are motivated by love, but the message you send to your children is that these people are evil or depraved - that they are people to be feared. Ignorace leads to fear, and fear leads to violence. That is when black men get dragged behind pickup trucks, and gay men get tied to a fence and pistol-whipped, and transwomen get stabbed forty times. Not because of anything they've done, but because of who they are.

Do you want that on your conscience?