Bravo, "what we once were", change, that does not mean the desires are gone, only that the spirit to control them are there. Yes one who is homosexual inside can be a Christain outside, those are probably among the strongest, because they have the hardest test of faith.
Romans 7:
13
Did, then, what is good become death to me? Never may that happen! But sin did, that it might be shown as sin working out death for me through that which is good; that sin might become far more sinful through the commandment.
14 For we know that the Law is spiritual; but I am fleshly, sold under sin.
15 For what I am working out I do not know. For what I wish, this I do not practice; but what I hate is what I do.
16 However, if what I do not wish is what I do, I agree that the Law is fine.
17 But now the one working it out is no longer I, but sin that resides in me.
18 For I know that in me, that is, in my flesh, there dwells nothing good; for ability to wish is present with me, but ability to work out what is fine is not [present].
19 For the good that I wish I do not do, but the bad that I do not wish is what I practice.
20 If, now, what I do not wish is what I do, the one working it out is no longer I, but the sin dwelling in me.