I will try to briefly around the issue
**Make it clear that I am not allowed to decide**
1- You need to clarify if today a christian symbol as a cross is an avoydo zoro,
סוגיא של שיתוף ושל האמונה שיש כיום. יש גם ע"ז שביטלו אותה
2- You need to clarify if the food itself has this form or the package.
3- The object is an offering to an idole or an Idole? An offering that has not been offering yet, that was manufactured by an idolatrous is prohibited.
In the guemoro (masseches Avoda zara, and a litle in Rosh Hashana) some ustensiles with drawings. if there are not honorific are not prohibed.
4- there is a difference if the form is in relief or not.
All this was an invitation to explain the case.
But if it is with a Kashruss, all the questions are probably resolved.
Following the comment,I feel I understand that the case is as follows:
1- the problem is In package. The packaging is certainly not a recipient of great value. Moreover the image is printed and certainly not embossed.
-->In Shulhan Aruch Yoreh Deah 141 sayf 3, If there are utensils with drawings of idols, and these are not honorary utensils (package is intended to
be thrown in the trash and is certainly not designed to be used for
worship.). The package can be used because the drawings are only decorative.
2 - the symbol is christian fish symbol, plus a verse of new Testament.
---> In Shulhan Aruch (YD 141-6), the permission is clearly mentionned, embossed too.
--> This specific fish is not the object of worship, but tells a (supposed) miraculous event.
3 --> A verse of New Testament is not an Avoda Zara. It is not holly following the halocho. But not an object of A.Z. There is a problem with sifrey akum (Yoreh Deah 139). But it is almost certain that it is not relevant here.it is not forbidden for a bookbinder to work on such books
Nevertheless I wish you good appetite.
------> It is perfectly kosher; is it tasty?