What is the meaning of Believe_in?

To accept as true, particularly without absolute certainty (i.e., as opposed to knowing).

To accept that someone is telling the truth.

To have religious faith; to believe in a greater truth.

To opine, think, reckon.

[with in]

1. To ascribe existence to.

   To ascribe existence to.

   To believe that (something) is right or desirable.

   To have confidence in the ability or power of.

   singular present subjunctive of believen

   Source: wiktionary.org