<p>I would think religion would be less of an issue than your being from New York/New Jersey. I think immediately of two cultural references:</p>
<ul>
<li>the Pace picante sauce add with the guy yelling NEW YORK CITY??!! in an obviously pejorative way</li>
<li>the movie (before your time, I’m afraid 
) Terms of Endearment, where the John Lithgow character explains away some very rude behavior by a cashier with “must be from New York”.</li>
</ul>
<p>You will find that Texans and most southern and southwesterners are somewhat uncomfortable with the concept of “New York behavior”, which is stereotypically the polar opposite of “southern hospitality”. Though Texas is not actually “southern”, it is close enough for this to be a reality.</p>
<p>You will have no issues with being from New York so long as you avoid behaving in a rude, pushy, loud and abrasive manner. I am addressing a stereotype, not the actuality… I hope you see that.</p>