Me And My Husband Have Been Trying To Conceive For

Me and my husband have been trying to conceive for a couple of months and we tried a method where he ejaculates into my mouth then I use a syringe to squirt it into my vagina. Would that kill all the sperm and be useless. Are we wasting our time or do we still have a chance for it to swim and fertilize and egg even if mixed in with a little saliva