can an openly practicing gay be an RCIA instructor?

Right in the seat of our archdiocese at the Cathedral parish, one of the RCIA instructors is an open and active homosexual. The same is true of the lead organist who leads the choir.

Is a faithful Catholic obligated to call this out, or “let him who is without sin cast the first stone”?

The situation you describe is scandalous. I strongly recommend you contact The St. Joseph Foundation for help.

2287 Anyone who uses the power at his disposal in such a way that it leads others to do wrong becomes guilty of scandal and responsible for the evil that he has directly or indirectly encouraged. "Temptations to sin are sure to come; but woe to him by whom they come!"90

God bless you. You are in my prayers.

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