"since we believe" is correct and usable in written English.
You can use it to introduce a clause that follows a logical conclusion based on the belief stated in the first part of the sentence. For example: "Since we believe that everyone is entitled to an education, we strive to make quality schooling accessible to everyone."
Since we believe that, we have to put our energies where our thinking is.
23 Since we believe that distinction should continue to be observed, we reverse the judgment of the Court of Appeals.
There is also giddiness in Detroit, after the Lions won a game for the first time since, we believe, Eisenhower was president.
Here X is hours spent studying per week, the "independent variable". Y is the exam scores, the "dependent variable," since — we believe — those scores depend on time spent studying.
Additionally, since we believe habitat loss to be the greatest threat to the species, more research needs to be done on the rate of habitat loss and the impact on the species.
"We remain focused on the resumption of direct negotiations, since we believe that is the only route to a lasting stable peace," she said at a late-night news conference here after a 14-hour marathon of meetings.
Ryanair said in a statement: "Since we believe a six-year time limit for submitting such claims is both unnecessary and unreasonable, we have instructed our lawyers to immediately appeal this ruling".
It has been developed in the framework of Self-Adapting Numerical Softwere (SANS) since we believe such an approach can deliver the convenience and ease of use of existing sequential environments bundled with the power and versatility of highly tuned parallel codes that execute on clusters.
Especially since we believe, as stressed infra, that the problem of photo and mechanical reproduction calls for legislative guidance and legislative treatment, we feel a strong need to obey the canon of judicial parsimony, being stingy rather than expansive in the reach of our holding.
This final item is of key focus for the workshop, since we believe that new curricula which bring various ideas of certification and scalability to the classroom will doubtless provide a new generation of researchers and practitioners who will be energized and enabled to take on the problems whose solutions we may see today as impractical.
It's usually called the Arch of Trajan, because Trajan was the one to have founded this particular city, but it is almost certainly not an Arch of Trajan, since we believe it was put up in the late second century A.D. But we still call it the Arch of Trajan, because that's its conventional name.
