It seems "Biblical knowledge" was all a bluff by the atheists.
The 10 commandments are followed today because Jesus summed them up by saying, "Love God with all your heart and love your neighbor as you love yourself." This is the summation of the 10 commandments.
Also, homosexuality is still a sin because Paul spoke against it and his writings are inspired by God. Ergo, homosexuality is still off the table.
You guys claim you used to be Christians and you are asking very basic questions!