Take a look. You might find something useful.

(GENERAL) Are All Religions Fundamentally the Same?

(ATHEISM) Heart Questions: Christian and Atheistic Answers

(ATHEISM) Faith in the Judeo-Christian and Atheistic Worldviews

(ATHEISM) Six Miracles Atheists Believe

(GENERAL) My Testimony—”You Must Be Born Again”

(ISLAM) Hell/Jahannam, Heaven/Jannah, and Righteousness (This is my “last effort” if my Muslim friend has decided to stop studying together.)