is there any evidence outside of the Bible to disprove Islam?
Hi, I don't know much of what Muslims believe, but I do know that the bible contains the truth about God, and about many other things.
If anyone is teaching anything other than Jesus, God, Who always existed, yet born of a virgin, taking the form of a man, taught, healed, forgave, and much more,
his death and resurrection for all sin, and that He freed us from satan by such, and that He reconciled us with God by such, and that our sins are forgiven past, present and future upon belief by such,
and when we by faith put our trust/belief in Christ, we are a new creation, born again, and are alive for the first time in our lives (spiritually and much more) and will be with Him in heaven forever;
that's fairly much the basics, but teachings contrary to such is not about God except as pertains to theological differences among Christians on certain matters, but generally above is the basics.
blessings,
tapero