I don't know which sentence is true and I need some help.
I believe that the faculty members will be very useful for my future studies.
or
I believe that the faculty members are going to be very useful for my future studies.
I don't know which sentence is true and I need some help.
I believe that the faculty members will be very useful for my future studies.
or
I believe that the faculty members are going to be very useful for my future studies.
It should be faculty memberships rather than faculty members, as you are going to make use of the memberships rather than your fellow members.
'will' and 'be going to' have very slight different meanings, but both could be used here, depending on your intentions.
https://dictionary.cambridge.org/dictionary/english/will
Be going to or will? Will is often used in a similar way to be going to. Will is used when we are talking about something with absolute certainty. Be going to is used when we want to emphasise our decision or the evidence in the present: …
https://dictionary.cambridge.org/grammar/british-grammar/future-be-going-to-i-am-going-to-work
Predictions
We use be going to to predict something that we think is certain to happen or which we have evidence for now:
It’s going to snow again soon. (The speaker can probably see dark snow clouds.)
Either way is fine.
I also think "faculty members" makes much more sense than "faculty memberships."