All religions are equally nonsensical, but a *true* Christian would still love you whatever your religion.
Is converting to Islam worth getting disowned?
No. Be faithful to what you are, not to passing fancies. Any differences betwen those religions, including Judaism, are simply matters of degree. Christianity is a bit more difficult to understand, but carries many merit worthy concepts. Perhaps one day there will be a merger of sorts.
If your parents are both Christian then Christian is the right way to go. Christ is the only God who was ever resurrected with witnesses, the only one who died for you, was crucified for you and went to hell for you. He will be back to judge the living and the dead. Do not gamble with your soul. No one else can say they were resurrected - not mohammed, not buddha, not shiva, etc. No other person can claim that. Turn back to God. You are in for a grave disappointment. Dont do it. Jesus says I am the way the truth and the life, no man can come to the father but by me. He also says there is no other name under which man can be saved except by Jesus. I have been before him due to near death experiences: My heart, blood pressure, loss of blood during birth...He is real and powerful. Dont turn away from God.
Converting from following one farce to another isn't worth anything.
For the first part of your question i would say all religions are equal, and for the second one disowning in the name of religion is not fair.