All of this occurred because a Jew who was himself not observant was willing to be the tenth man in a minyan, so that another Jew could say Kaddish on his father's yartzheit. Speak to Bnei Yisrael and let them turn back and encamp before Pi Hachiros. This was the only Egyptian idol that remained. Imrei Chein explains that this is the god of gold. Regrettably, this idol is still with us to this very day.
People still worship gold.
He catalyzed their return to the Almighty. Then Moshe and the Bnei Yisrael chose to sing . Everyone sang together, says Horav Shlomo Margolis, Shlita, but the feeling of salvation was a personal one. Each individual, according to his own spiritual plateau and perspective, experienced the yeshua, salvation, differently. They could not drink the waters of Marah because they were bitter.