Right, believe in both members of the trinity. And lets not forget the third member of the trinity, the Holy Spirit.Believing in God and believing in Jesus aren't the same thing.
John 14
1“Do not let your hearts be troubled. You believe in God; believe in Me as well.
I have encouragement for you. If you are a genuine born–again Christian, you have a relationship with the Holy Spirit, whether you have acknowledged Him as part of the trinity or not.