What determines whether one is a child of Abraham?

Answer

"Know you therefore that they which are of faith, the same are the children of Abraham." Gal. 3: 7.
NOTE - Because of unbelief many of the Israelites fell in the wilderness, and were not permitted
to enter the promised land. Num. 14:27-33; Deut. 1:34-36.

When did this long period expire?
By what may we know that we have passed from death unto life?
When did Sin and death enter the world?
How early was this sacrificial system known?
How long did he continue this work there?
What will be the fourth plague?
What has this firm trust in Jesus led many to do?

Questions & Answers are from the book Bible Readings for the Home Circle