[metmom]

count-your-change is right.

Here are the definitions of assume form Merriam-Webster; particularly #5. It does not contain your definition.

http://www.merriam-webster.com/dictionary/assume

a : to take up or in : receive b : to take into partnership, employment, or use

2 a : to take to or upon oneself : undertake *assume responsibility* b : put on, don c : to place oneself in *assume a position*

3: seize, usurp *assume control*

4: to pretend to have or be : feign *assumed an air of confidence in spite of her dismay*

5: to take as granted or true : suppose *I assume he’ll be there*

6: to take over (the debts of another) as one’s own

[annalex]

Perhaps (5) Still, we don’t take for granted that Mary did not have other children just so, we believe the witness of the Church.

However, I don’t argue over words. Whatever it is you think we are doing, it is a belief based on our belief in the historical witness of the Church, the same belief that we have in the scripture as a historical document produced by the Church.