You are mistaken, and clearly whoever answered you was mistaken. It is unmistakenly clear if one reads the Quran that the God Muslims worship is the same God of Abraham, Moses and Christ. It is spelled out very clearly. I recommend you read a comparative religion book from an unbiased source https://www.amazon.com/Comparative-Religion-Dummies-William-Lazarus/dp/0470230657
Get an introductory book on Comparative Regions. Go across the various religions. Once you are familiar you will want to dig down on several. If you are very new to religions and religious studies, try: https://www.amazon.ca/Comparative-Religion-Dummies-William-Lazarus/dp/0470230657/ref=asc_df_0470230657/?tag=googlemobshop-20&linkCode=df0&hvadid=292892788772&hvpos=1o1&hvnetw=g&hvrand=8427209198787662683&hvpone=&hvptwo=...