The Trinity Question

There is a controversy going on in our beloved Seventh-day Adventist Church. This controversy is whether or not the Trinity is Biblical or pagan. The main part of the anti-trinitarian belief seems to be that it is only God the Father, and God the Son, Jesus, and that the Holy Spirit is just an impersonal force, or is Jesus Himself. In other words, they believe there are only two members of the Godhead, not three. At least one reason for their believing this is that they believe the Trinity is a catholic doctrine, and they want to move away from paganism. This is a noble desire, to move away from paganism. But just because the catholic church uses the word trinity, it does not make the Biblical truth on the subject a lie. Could it be, that like other truths from the Bible, the Catholic church just borrowed it and perverted it, like they did with other things, like communion?