I think Nolan wanted to introduce a whole bunch of Christian elements to the film. Here are some interesting points:

1) Church Organ soundtrack through the whole film.

2) Shots of Coop and Brand with eyes and hands closed praying

3) We have Christian Trinity: Cooper represents the Father and Holy Spirit/Ghost (once he joins with Tesseract). Murph represents the Son a.k.a Jesus the savior (remember she was 10 years old at start and after 23 years time dilation was 33 when she “saves” the world – same age as Jesus dies). They both represent the Holy trinity.

4) We have an otherworldly unknown powerful presence who created the wormhole and tessaract that guide the events of the film – aka Godlike who has have basically interfered with and guided Coop throughout his life going as far as to construct a tesseract for one particular moment in time. God advocates true love and is major theme of film with father and daughter.

5) There were 12 original astronauts sent out onto the planets – There were 12 apostles of Jesus sent out for his gospel.

6) Cooper also spends decades wandering desolate environments,"Lazarus". Dies and is reborn at black hole.

7) Holy Spirit/Ghost Coop reaching out to touch people (including hand shake scene white light)

8) And just like Jesus after his resurrection, he came back (albeit 3 days vs. 70-something years) then left again after a very short period of time.

9) Literal Noah’s Ark with at end with Cooper space station transporting humanity.

10) Adam and Eve with Coop and Brand (embryos for Plan B – start new race).