For me the trinity doctrine doesn't make sense and yes I've read Trinitarians posts on other boards, who have tried in many various ways to explain it. For the dogmatic ones, they believe it's necessarily to one's salvation to believe in it. Yet they too believe in a loving God, yet their "loving God" would let me burn in hell forever if I can't believe in something that doesn't make sense?
The bigger issue, to me is, what religious beliefs make people become. Calvin had Servetus burned alive at the stake over the trinity. Was that the way a person who preaches a loving God supposed to act?