Q24)Both Jews and Christians believe that it was Isaac that was offered for sacrifice while Muslims believe that it was Ismael.How can you support this.And the covenant was sealed with offer of sacrifice of Isaac.

A) So when the covenant was made and sealed (circumcision and sacrifice) Abraham was ninety nine and Ishmael thirteen years old. Isaac was born a year later when Abraham was a hundred years. The descendants of Ishmael, Prophet Muhammad (PBUT),including all Muslims, remain faithful until today this covenant of circumcision. In their prayers at least five times a day the Muslims include the praise of Abraham and his descendants with the praise of Muhammad (PBUH) and his descendants.
The details on this topic are in chapter “Muhammad in the bible” on page 51 small booklet by Dr.Bagel,name ” Muslim Christian dialogue” and here is the link.