Marriage issues in the Philippines

My husband and I are civilly wedded and we have not separated until now. My husband adopted a child with his mistress (Muslim), now his second wife, after his conversion to Muslim (without my consent). His conversion to Muslim was consented to by me because he was working as a nurse in Saudi Arabia at that time, and he said he needed to be converted to make his life easier in the said country. I am not aware that the main reason was to marry his Muslim mistress, who is also working in Saudi Arabia. Will this adopted child have the right to inherit what we own? Is he allowed to marry as a Muslim without my consent? Are all their actions (husband and second wife) legal? What should I do as the legal wife? Thank you.