Why does shylock refuse to go to bassanios home

In lines 29-34 Shylock gives his reason.

"Yes, to smell pork; to eat of the habitation which your prophet, the Nazarrite, conjured the devil onto! I will buy with you, sell with you talk with you, walk with you and so following; but I will not eat with you, nor pray with you."

Shylock's reasons are to do with his own religious beliefs.